PHPDoc to provide autocompletion for IDE for Opencart 1.5.4+

OpenCart phpdoc

@property Cache       $cache
* @property Config      $config
* @property Currency    $currency
* @property Customer    $customer
* @property Document    $document
* @property Language    $language
* @property Loader      $load
* @property Registry    $registry
* @property Request     $request
* @property Response    $response
* @property Session     $session
* @property URL         $url
*
* @property integer     $id
* @property string      $layout
* @property string      $template
* @property array       $children
* @property array       $data
* @property string      $output
*
* @property ModelCatalogCategory     $model_catalog_category
* @property ModelCatalogProduct      $model_catalog_product
* @property ModelToolImage           $model_tool_image
* @property ModelCatalogManufacturer $model_catalog_manufacturer
* @property ModelCatalogInformation  $model_catalog_information
* @property ModelCatalogReview       $model_catalog_review
* @property ModelCheckoutOrder       $model_checkout_order