TODO: 
        - Support spectators
        - Add a pretty panel to display who's turn it is, and who is spectating
        - Stop the game after two passes, and detect a winner. 
        - Add Atari Go mode. 
        - Add a 'Help' button that will take you to the PlayGo wiki page. 
        - Integrate with GnuGO
	- Add different types of Ko and different rulesets.