Added null catcher for null GameState
Implemented PieceStage w/ minimal rendering demo
Implemented C Control: Hold/Swap Pieces
Decoupled collision logic from CoreState and moved into CollisonSets.js
Resolves issue #29, use this PR as reference to finish issue #31
Added null catcher for null GameState Implemented PieceStage w/ minimal rendering demo Implemented C Control: Hold/Swap Pieces Decoupled collision logic from CoreState and moved into CollisonSets.js
Resolves issue #29, use this PR as reference to finish issue #31