Build 0.7

Here come build 0.7, with UI changes and fixes, and a Taiko sound effect on the buttons.

Yes, I know the Taiko sound effect is loud and obnoxious, but it is there to try the sound system and options.
This will very likely change in the future.

Taiko SFX (CC-BY 3.0): https://freesound.org/s/95624/

The next objective is to start building the opponent AI.

CHANGELOG:
- added Button sound effect
- added Win and Lose screen
- added UI State Machine, for better stability
- changed In Game gear icon to open the new Pause menu
- added In Game UI fading transitions

- fix: broken UI until resizing the screen, when loading new scenes