Made BoardStateValues class to hold row/column/value info instead of array. Implemented alpha-beta pruning in AI search.
Added depth to AI search
made new branch with simpler version of minimax
Implemented alpha-beta pruning in minimax. Now plays 4x4 quickly.
Added blank lines above board, makes game on console more readable
Changed tests to include empty space in front of board
Added helper to allow iteration through empty cells in board
Refactored reassignment of alpha-beta
Refactored recursive call in minimax
merged branches