Fixes #74
Rendering game boards with left/right arrows to move forward and backward through the moves.
Added a global dict to store Game() instances to run the history boards. Using a stack to move back one move and using existing backend code to move forward one move.
Fixes #74 Rendering game boards with left/right arrows to move forward and backward through the moves. Added a global dict to store Game() instances to run the history boards. Using a stack to move back one move and using existing backend code to move forward one move.