Happy new year to the wonderful Godot community!
We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.
Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
Moved GDNative singletons discoverer from register_types to
GDNativeSingletonEditor.
Fix enable/disable switch in GDNativeLibrarySingletonEditor.
Separate `gdnative/singletons` and `gdnative/singletons_disabled`
project settings, keeping "on by default" behavior.
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.
