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/states/Splash.java

@@ -18,12 +18,12 @@
 
 package itdelatrisu.opsu.states;
 
-import itdelatrisu.opsu.MusicController;
 import itdelatrisu.opsu.Opsu;
 import itdelatrisu.opsu.OsuParser;
 import itdelatrisu.opsu.OszUnpacker;
-import itdelatrisu.opsu.SoundController;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.audio.MusicController;
+import itdelatrisu.opsu.audio.SoundController;
 
 import java.io.File;