Bitwise game state

[PhilipCramer]

Changes

• Board implementation now uses only 2 bits for each field to reduce memory
• State now heavily uses rust type system for underlying constructs
• Updated State to track skipped turns for determining game end condition
• Monte Carlo tree search now expands correctly.
• Included console game for playing in the terminal
• Included binary target for running ai vs ai testing of exploration factor in ucb formula

Benchmark results

@Kraminius