v0.4: Tweaks, Basic UI, End game, settings, serialization, and mobile version

[Clauvin]

• Add button to close the game
• Analyze UI to deal with multiple resolutions;
• Research and fix screen to keep its scale when changing its resolutions
• Fix Pause UI to not vary it's position depending of the size of the screen, relative to the blocks
• Add test for the close button
• More Unity editor improvements
• Add chain multiplier to score calculations;
• Add chain multiplier tests;
• Add proto main screen;
• Add proto settings screen;
• Add first part of proto game over screen;
• Add proto game over screen;
• Sounds and music; #31
• To settings screen: add sounds and music volumes;
• To settings screen: add initial size of the play area;
• To settings screen: add initial difficulty level;
• To settings screen: pick between three different music;
• Add serialization of settings to save and load those as needed;
• Testing and code refactoring;
• Make Windows build;
• Try to make an Android build;
• Adapt game to work on mobile as well;
• Make Android build;
• Good point to update the CV;