Follow-up to #99: replay seeking improvements.

- Added on/off option for replay seeking in the "custom" menu.
- Mute sounds while seeking.
- Draw a bar on the left of the screen during replays for seeking (instead of just clicking near the top of the screen).

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/states/OptionsMenu.java

@@ -93,7 +93,8 @@ public class OptionsMenu extends BasicGameState {
 			GameOption.FIXED_HP,
 			GameOption.FIXED_AR,
 			GameOption.FIXED_OD,
-			GameOption.CHECKPOINT
+			GameOption.CHECKPOINT,
+			GameOption.REPLAY_SEEKING
 		});
 
 		/** Total number of tabs. */