Compiler self call support

[XdotCore]

Resolves #1133

Description

1. Adds support for GMS2.3+ self calls in the compiler, cherrypicked from UndertaleModTool Community Edition.

2. Fixed an issue where sub functions in an object should be stored in a self variable without the object function name suffix.
   Example: the utmt compiler would make gml_Script_act_gml_Object_menu_chapter_btn_Create_0 be stored in self.act_gml_Object_menu_chapter_btn_Create_0 when the original game code had self.act.

Caveats

None

Notes

I've tested this with Submachine Legacy (2023.8), and the one from #1133 (2022.5)

How to Reproduce:

1. Create a function in a GlobalScript or Object code, then call that function from another function
   

2. In gamemaker (I've only tested this for 2023.8), make a function in an object, then call that function from another one in the same object
   

[Jacky720]

See also #564.