1.4 a stronger game

1.4 adds code for forks and pins and a bunch of bug fixes and refactoring.

Also now trims some moves to speed up the ai.

There was a silly bug where the A.I. refused to promote pawns as it believed that going to the other side of the board would turn it into a queen of the opposite colour.

There was also a significant bug fix that sorts out looking ahead for checkmate.

Overall a much stronger game but still nowhere near the level of Pico Checkmate by krystman