Sound effects

[Amelia-Lopez]

Right now there's background music, but three are no sound effects for the following events:

• piece rotate sound?
• piece hitting one of the walls
• piece settling into place (floor or on another piece)
• row being completed
• two rows completed
• three rows being completed
• four rows (tetris!) being completed
• four rows being completed twice in a row
• game over sound
• abort game sound?
• new high score sound