Fixed: Bug where GUI wouldn't properly update after a move by human
Fixed: Bug where move() didn't properly change the position of a Queen
Fixed: equals() method in Queen to use variables correctly

Ruined: AStarAI. Too many bugs to fix, now gives errors. Please ignore.

Added: AStarTwoAI. Reboot of AStarAI that actually works, currently only for moves of one color.
Added: isGameOver() method in Board