* Global.gd now has an extra variable for current room type
* ResourceSetterNew.gd now has variation category for room types
The state variable also had to include the room type, since it wouldn't update properly when entering a bonus room from a level that's already underground
* LevelClass.gd sets room type on update_theme
A new function, get_room_type() allows for the level's room type to be detected, which can easily be overwritten by other level classes. Bonus Rooms are detected by comparing the level's scene path to a pre-defined list of bonus rooms.
* Added get_room_type() to CoinHeaven.gd
* Added get_room_type() to PipeCutscene.gd
Also updates the room type in _enter_tree() since update_theme() isn't called here.
* Added get_room_type() to TitleScreen.gd