Changed BMGame->passStatusArray to BMGame->nRecentPasses, since all we need is to note how many consecutive passes have just occurred. This change enables the next step, which is to write nRecentPasses to the database on a save_game(), and read it on a load_game().
Added logic to write BMGame->nRecentPasses to the database on a save_game(), and read it on a load_game(). Added unit tests.