Add support for Pico-8 in Notepad++'s function list

functionlist.xml

<!--
Adds support for the Function List window in Notepad++ (tested with v6.9.2)

This file is normally located at C:\Users\<username>\AppData\Roaming\Notepad++\functionlist.xml
You could probably use this to support general lua functions too, but I haven't tested that.
-->

<NotepadPlus>
 <functionList>
  <associationMap>
   <!-- 
     Existing stuff
     ...
   -->
   <association langID="23" id="pico8_function"/>
  </associationMap>
  <parsers>
   <!-- 
     Existing stuff
     ...
   -->
   <parser id="pico8_function" displayName="Pico-8 Function">
    <function mainExpr="^[\t| ]*function[\t| ]*.*?\)" displayMode="node">
     <functionName>
      <nameExpr expr="^[\t| ]*function[\t| ]*\K.*\)"/>
     </functionName>
    </function>
   </parser>
  </parsers>
 </functionList>
 </NotepadPlus>