Removed difficulty. Renamed 'Save' to 'Hold'.

renamed a few variables:
	loss -> lose.
	Save -> Hold

Removed difficulty. Game doesn't save or read the difficulty variable from DB
anymore. So you'll need to fix that in your saves.

Removed variable board sizes. Still saved/read from DB at the moment.

Add a pause_ticks variable that counts down for each game tick that the game is
paused. When it's zero the game can no longer be paused.

Add point bonuses for 'soft' and 'hard' drops.
Soft drops(pressing 'S') adds one point per block.
Hard drops(pressing 'W') adds two points per block.

Point modifiers for multiple line clears. Beginning concept of difficult moves.
4 line clear counts as a difficult move. Sequential difficult line clears yield
a 3/2 point bonus.

TODO:
	Next are wall kicks!
	Floor kicks, and per-piece rotation mechanics.
	Slightly modify the 'Hold' mechanism to fit better with the Tetris
		Guidlines.
	T-Spins and more point bonuses.
	Longer Next pieces list.
version bump