Swift Macros

[migueldeicaza]

Some macros that we could use to improve the experience:

• Macros: Could use instead of the property wrapper for Binding, as that one relies on extracting the property name from the KeyPath. #88
• Macros: Exporting properties as Godot properties without having to do the custom registration #87
• Macros: Exporting methods as Godot methods, without having to do custom registration or being limited to Variant parameters. #86
• Macros: Automatic class registration. #85

[migueldeicaza]

Closing as this will just be eternally open as we find more uses for Macros.