Put the .xml files in your {ide-settings-dir}/config/templates - put the .php files in {ide-settings-dir}/fileTemplates

CustomSiteConfig.php

<?php

/**
 * Class CustomSiteConfig
 *
 * @property SiteConfig \$owner
 */
class CustomSiteConfig extends DataExtension {
	static \$db = [
		'AddressLineOne'      => 'Varchar(255)',
		'AddressLineTwo'      => 'Varchar(255)',
		'AddressLineThree'      => 'Varchar(255)',
		'AddressLineFour'      => 'Varchar(255)',
		'Phone'               => 'Varchar(255)',
		'Fax'                 => 'Varchar(255)',
		'Email'               => 'Varchar(255)',
		'CustomHeaderOutput' => 'Text',
		'CustomFooterOutput' => 'Text'
	];
	
	static \$has_one = array(
		'PrivacyPolicyPage'      => 'SiteTree',
		'TermsAndConditionsPage' => 'SiteTree'
	);


	public function updateCMSFields(FieldList \$fields) {

		/**
		 * Linked Pages
		 */
		\$fields->addFieldsToTab('Root.Main', [
			TextField::create('AddressLineOne'),
			TextField::create('AddressLineTwo'),
			TextField::create('AddressLineThree'),
			TextField::create('AddressLineFour'),
			TextField::create('Phone'),
			TextField::create('Fax'),
			EmailField::create('Email'),
		]);

		/**
		 * Advanced Options
		 */
		\$fields->addFieldsToTab('Root.Advanced', [
			TextareaField::create('CustomHeaderOutput', 'Custom Header Tags'),
			TextareaField::create('CustomFooterOutput', 'Custom Footer Tags')
		]);
	}
}

Extending Silverstripe Page.php

<?php
class ${NAME} extends ${Extends} {

}

class ${NAME}_Controller extends ${Extends}_Controller {
}

Silverstripe DataObject.php

<?php

class ${NAME} extends DataObject {

	protected static \$db = [
		'Title' => 'Varchar(255)',
		'SortOrder' => 'Int'
 	];
 	
 	protected static \$default_sort = 'SortOrder';
 	
 	public function getCMSFields(){
 	
 	    \$fields = new FieldList([
 	        TextField::create('Title')
 	    ]);
 	    
 	    return \$fields;
 	
 	}

	public function canView(\$member = null) {
		return Permission::check('CMS_ACCESS_CMSMain', 'any', \$member);
	}

	public function canEdit(\$member = null) {
		return Permission::check('CMS_ACCESS_CMSMain', 'any', \$member);
	}

	public function canDelete(\$member = null) {
		return Permission::check('CMS_ACCESS_CMSMain', 'any', \$member);
	}

	public function canCreate(\$member = null) {
		return Permission::check('CMS_ACCESS_CMSMain', 'any', \$member);
	}

}

Silverstripe ModelAdmin.php

<?php

class ${NAME} extends ModelAdmin {

	private static \$managed_models = array(
		'${Model_Class}'        => ['title' => '${Model_Title}']
	);

	private static \$url_segment = '${URL_Segment}';

	private static \$menu_title = '${Menu_Title}';

	public function getEditForm(\$id = null, \$fields = null) {
		\$form = parent::getEditForm(\$id, \$fields);

		\$gridFieldName = \$this->sanitiseClassName(\$this->modelClass);
		/** @var GridField \$gridField */
		\$gridField = \$form->Fields()->fieldByName(\$gridFieldName);


		if (\$this->modelClass === '${Model_Class}') {
			// modify the list view.
			\$gridField->getConfig()
			->addComponent(new GridFieldFilterHeader());
		}

		return \$form;
	}
}

Silverstripe Page.php

<?php
#set( $Extends = 'Page' )
class ${NAME} extends ${Extends} {

}

class ${NAME}_Controller extends ${Extends}_Controller {
}

SilverStripe PHP.xml

<templateSet group="SilverStripe PHP">
  <template name="has_many" value="private static $has_many = [&#10;    $END$&#10;];" description="Has many" toReformat="true" toShortenFQNames="true">
    <context />
  </template>
  <template name="cmsFields" value="public function getCMSFields(){&#10;&#10;    $this-&gt;beforeUpdateCMSFields(function(FieldList $fields) {&#10;&#9;&#9;$END$&#10;&#9;});&#10;&#10;&#9;$fields = parent::getCMSFields();&#10;&#10;&#9;return $fields;&#10;}" description="GetCMSFields() function" toReformat="false" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="has_one" value="private static $has_one = [&#10;    $END$&#10;];" description="Has one" toReformat="true" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="db_fields" value="private static $db = [&#10;    $END$&#10;];" description="DB Fields" toReformat="true" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="field" value="$fields-&gt;addFieldToTab('$TAB$', $FIELDTYPE$::create('$FIELDTITLE$', '$FIELDTITLE$'), '$BEFORE$');" description="Add Field" toReformat="true" toShortenFQNames="true">
    <variable name="TAB" expression="" defaultValue="&quot;Root.Main&quot;" alwaysStopAt="true" />
    <variable name="FIELDTYPE" expression="" defaultValue="&quot;TextField&quot;" alwaysStopAt="true" />
    <variable name="FIELDTITLE" expression="underscoresToSpaces(String)" defaultValue="" alwaysStopAt="true" />
    <variable name="BEFORE" expression="" defaultValue="" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="create:UF" value="UploadField::create('$NAME$', '$END$')" description="SS Upload Field" toReformat="false" toShortenFQNames="true">
    <variable name="NAME" expression="" defaultValue="" alwaysStopAt="true" />
    <context />
  </template>
  <template name="many_many" value="private static $many_many = [&#10;    $END$&#10;];" description="Many many" toReformat="true" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="field_labels" value="private static $field_labels = [&#10;    $END$&#10;];" description="Silverstripe Field Labels" toReformat="true" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="can" value="public function canView($member = null) {&#10;&#9;&#9;return $CAN$;&#10;&#9;}&#10;&#10;&#9;public function canEdit($member = null) {&#10;&#9;&#9;return $CAN$;&#10;&#9;}&#10;&#10;&#9;public function canDelete($member = null) {&#10;&#9;&#9;return $CAN$;&#10;&#9;}&#10;&#10;&#9;public function canCreate($member = null) {&#10;&#9;&#9;return $CAN$;&#10;&#9;}" description="All canXXX Actions" toReformat="true" toShortenFQNames="true">
    <variable name="CAN" expression="" defaultValue="true" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="canDefault" value="public function canView($member = null) {&#10;    return Permission::check('CMS_ACCESS_CMSMain', 'any', $member);&#10;}&#10;&#10;public function canEdit($member = null) {&#10;    return Permission::check('CMS_ACCESS_CMSMain', 'any', $member);&#10;}&#10;&#10;public function canDelete($member = null) {&#10;    return Permission::check('CMS_ACCESS_CMSMain', 'any', $member);&#10;}&#10;&#10;public function canCreate($member = null) {&#10;    return Permission::check('CMS_ACCESS_CMSMain', 'any', $member);&#10;}" description="All default canXXX Actions" toReformat="true" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="gridfield_gallery" value="$$$NAME$Config = new GridFieldConfig_RecordEditor();&#10;$$$NAME$Config-&gt;removeComponentsByType('GridFieldAddNewButton');&#10;$$$NAME$Config-&gt;addComponent($bulkUploadConfig = new GridFieldBulkUpload());&#10;$$$NAME$Config-&gt;addComponent(new GridFieldSortableRows('SortOrder'));&#10;$$$NAME$Config-&gt;addComponent(new GridFieldGalleryTheme('Image'));&#10;$bulkUploadConfig-&gt;setUfSetup('setFolderName', 'Images/$LOCATION$');&#10;$$$NAME$ = new GridField(&quot;$NAME$GridField&quot;, &quot;$TITLE$&quot;, $this-&gt;$RELATION$(), $$$NAME$Config);&#10;$fields-&gt;addFieldToTab('Root.$TAB$', $$$NAME$);" description="Gallery Theme Gridfield" toReformat="true" toShortenFQNames="true">
    <variable name="NAME" expression="" defaultValue="" alwaysStopAt="true" />
    <variable name="LOCATION" expression="" defaultValue="" alwaysStopAt="true" />
    <variable name="TITLE" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="RELATION" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="TAB" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="gridfield_relation_editor" value="$$$NAME$Config = new GridFieldConfig_RelationEditor();&#10;$$$NAME$Config-&gt;addComponent(new GridFieldSortableRows('SortOrder'));&#10;$$$NAME$ = new GridField(&quot;$NAME$GridField&quot;, &quot;$TITLE$&quot;, $this-&gt;$RELATION$(), $$$NAME$Config);&#10;$fields-&gt;addFieldToTab('Root.$TAB$', $$$NAME$);" description="Relation Editor Gridfield" toReformat="true" toShortenFQNames="true">
    <variable name="NAME" expression="" defaultValue="" alwaysStopAt="true" />
    <variable name="TITLE" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="RELATION" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="TAB" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="gridfield_record_editor" value="$$$NAME$Config = new GridFieldConfig_RecordEditor();&#10;$$$NAME$Config-&gt;addComponent(new GridFieldSortableRows('SortOrder'));&#10;$$$NAME$ = new GridField(&quot;$NAME$GridField&quot;, &quot;$TITLE$&quot;, $this-&gt;$RELATION$(), $$$NAME$Config);&#10;$fields-&gt;addFieldToTab('Root.$TAB$', $$$NAME$);" description="Record Editor Gridfield" toReformat="true" toShortenFQNames="true">
    <variable name="NAME" expression="" defaultValue="" alwaysStopAt="true" />
    <variable name="TITLE" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="RELATION" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <variable name="TAB" expression="" defaultValue="NAME" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="DisplayedDropdownField" value="DropdownField::create('Displayed', 'Displayed', [1 =&gt; 'Displayed', 0 =&gt; 'Hidden']),$END$" description="Silverstripe Displayed Dropdown Field" toReformat="false" toShortenFQNames="true">
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="defaults" value="private static $defaults = [&#10;&#9;'$LABEL$' =&gt; $VALUE$$END$&#10;];" description="Default Values" toReformat="true" toShortenFQNames="true">
    <variable name="LABEL" expression="" defaultValue="&quot;Displayed&quot;" alwaysStopAt="true" />
    <variable name="VALUE" expression="" defaultValue="&quot;true&quot;" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
  <template name="default_sort" value="private static $default_sort = '$SORT$';$END$" description="Default Sort Order" toReformat="true" toShortenFQNames="true">
    <variable name="SORT" expression="" defaultValue="&quot;SortOrder&quot;" alwaysStopAt="true" />
    <context>
      <option name="PHP" value="true" />
    </context>
  </template>
</templateSet>

SilverStripe Template.xml

<templateSet group="SilverStripe Template">
  <template name="iif" value="&lt;% if $$$ifVar$ %&gt;$ACTION$$END$&lt;% end_if %&gt;" description="An inline if block" toReformat="true" toShortenFQNames="true">
    <variable name="ifVar" expression="" defaultValue="&quot;First&quot;" alwaysStopAt="true" />
    <variable name="ACTION" expression="" defaultValue="&quot;active&quot;" alwaysStopAt="true" />
    <context />
  </template>
  <template name="iife" value="&lt;% if $$$ifVar$ %&gt;$ACTION$&lt;% else %&gt;$ACTION2$$END$&lt;% end_if %&gt;" description="An inline if-else block" toReformat="true" toShortenFQNames="true">
    <variable name="ifVar" expression="" defaultValue="&quot;First&quot;" alwaysStopAt="true" />
    <variable name="ACTION" expression="" defaultValue="" alwaysStopAt="true" />
    <variable name="ACTION2" expression="" defaultValue="" alwaysStopAt="true" />
    <context />
  </template>
</templateSet>