Added configurable computer player - use 'com=random', 'com=minimax' etc as cmd-line args.

Default is AlphaBeta.
Updated ActionListener for UserChooserFrame so that selecting from the list (or typing a new name and pressing RETURN) also triggers the action.
Added the player and computer algorithm names to the title bar e.g. "Bob vs. Alpha-Beta".

src/model/comPlayer/AlphaBetaComPlayer.java

@@ -22,4 +22,9 @@ public class AlphaBetaComPlayer implements Player {
 	public boolean isReady() {
 		return true; // always ready to play a random valid move
 	}
+	
+	@Override
+	public String toString() {
+		return "Alpha-Beta ComPlayer";
+	}
 }