SoundController refactoring.

- Added enum classes SoundEffect and HitSound.
- Added a SoundComponent interface for sound effects and hit sounds, and extended playSound() and playHitSound() methods to play any SoundComponent.
- Moved features related to sample sets to the HitSound class, and rewrote sample sets as an internal enum class.

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

src/itdelatrisu/opsu/objects/Circle.java

@@ -21,9 +21,9 @@ package itdelatrisu.opsu.objects;
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.GameMod;
 import itdelatrisu.opsu.GameScore;
-import itdelatrisu.opsu.MusicController;
 import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.audio.MusicController;
 import itdelatrisu.opsu.states.Game;
 
 import org.newdawn.slick.Color;