Tetronumbers

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- Added a custom tile merge, which allows the user chose where the cell merges, board size has been balanced to match this. Controls are:
-Swipe down to merge downwards
-Swipe right to merge right
-Swipe left to merge left
-Swipe up to skip to the next available move or to spawn the next block if no moves are available.
-Updates to menu screen and game over screen though I still hope to improve both in the future
-Removed power-ups, Google Play Services &light mode
-Fixed minor glitches