Moving around variables for better scoping.
Cleaned up app init function.
Menu buuttons now have pointer on hover.
Fixed update function guard.
Formatting.
Removed unneeded call to notify function.
Added 'drop' functionality for spacebar key.
Added unique identifier to polyominoes.
Updated Polyomino constructor.

Fixed syntax error in variable declarations. Cleaned up code. Also the pivot property is now included in the serialization function.
I'd rather set the monominoes values as explicitly as possible.
Fixing some declaration leaks.
Clearing lines through the middle of polyominoes now works.
Prototype of the game screen is more or less working now.