sfgml and Feather

[YellowAfterlife]

Feather (the GMS2's new linter, currently in beta) generally does a good job at indexing GML code, but struggles with Haxe-generated code due to use of nullability and overall complexity (e.g. enum constructors inherit from base constructor).

On larger projects, Feather's attempts to re-index Haxe-generated code can also degrade the IDE performance to the point of hanging for seconds whenever auto-completion menu gets brought up.

Since Feather doesn't currently accept JSDoc for variable types and typedefs, this isn't something that can be addressed, so the generator will output a // Feather disable all comment to resulting files.

GMEdit, on other hand, has fewer issues with indexing Haxe-generated files, though there is still work to do in terms of annotating Haxe types for GMEdit to pick up.