Huge overhual

- We'll now using Godot's native UI elements along with a custom theme and fonts.
- Changing to the character's clothes is now done by referencing the instanced node instead of the game screen. You no longer have to blindly guess where to put the placeholders from in clothes scene because the placeholders are already there for changing.
- Classic mode now has it's own copy of the character node. This was the reason for the original setup.
- Disabled some debug warnings
- Window is now resizable and will respect aspect ratio
- Credits screen
- Global menu, WIP

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