Game options overhaul & new options.

- Separated options into "Display", "Music", and "Gameplay" tabs.
- New options: VolumeHitSound, DimLevel, PerfectHit
- Added options that were previously missing from Game Options screen.
- Added sounds to Game Options screen.

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

src/itdelatrisu/opsu/states/Game.java

@@ -262,8 +262,8 @@ public class Game extends BasicGameState {
 		int height = container.getHeight();
 
 		// background
-		if (!osu.drawBG(width, height, 0.7f))
-			g.setBackground(Color.black);
+		g.setBackground(Color.black);
+		osu.drawBG(width, height, Options.getBackgroundDim());
 
 		int trackPosition = MusicController.getPosition();
 		if (pauseTime > -1)  // returning from pause screen