Replace the random piece algorithm
Submitted by mis..@..il.com
Link to original bug (#749662)
Description
The official Tetris guideline has a much better system for distributing pieces than what's currently used here. The difficult piece mode should remain as is instead of adding this as a third option.
http://tetris.wikia.com/wiki/Random_Generator
"Random Generator generates a sequence of all seven one-sided tetrominoes (I, J, L, O, S, T, Z) permuted randomly, as if they were drawn from a bag. Then it deals all seven tetrominoes to the piece sequence before generating another bag"
Version: git master