Fix Check Detection

[linear]

The game_over function does not always return the correct value when the player is in check. The game_over function should also be split into tasks for stalemate check and checkmate.

[linear]

ARO-17 Fix Check Detection

The game_over function does not always return the correct value when the player is in check. The game_over function should also be split into tasks for stalemate check and checkmate.