Shapeout

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- Game modes now preloaded for significantly reduced loading times
- Added outlines to edges of blocks to make it more obvious which side to connect things to
- Help screen now shows automatically on your first game
- Fixed Classic mode ending when forming a shape on a full board
- Fixed floating scores blocking taps
- Fixed chance of block dropping on a recently full column being too high
- Added slight difficulty curve to Classic mode
- Performance improvements
- Minor UI improvements