- Make enums have an unique signature name of int. This means that when generating internal methods, there is no difference between different enums types nor between enums and int. This way enums can re-use internal methods.
- Make type resolver fallback to int if a type is not found and it's an enum.
Using `misc/scripts/fix_headers.py` on all Godot files.
Some missing header guards were added, and the header inclusion order
was fixed in the Bullet module.
