Fixed compareTo method. Operand order was inverted.

Implemented FallBoundary to allow for falling bricks deployment.
Enabled FallingBricks Power-Up.
FAST ball speed is now 7 (lowered from 8).
Moved Power-Up selection to a separate window on New Game.
Moved Power-Up selection to a separate window on New Game.
Moved Power-Up selection to a separate window on New Game.
Moved Power-Up selection to this window, to be called upon creation of a New Game.
Fixed FallBoundary being drawn.
Modified button unselected state to improve visisiblity. Added greyscale icons for unselected Power-Ups.