Options state refactoring.

- Renamed Options state into OptionsMenu, and created Options class for solely handling user options.  Moved everything unrelated to the actual options menu into the static Options class.
- OptionsMenu no longer has static fields.
- Refactored option tabs into an enum, which makes the code much cleaner.

Also fixed a bug where global volume wasn't being used on container initialization.

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

src/itdelatrisu/opsu/audio/SoundController.java

@@ -19,9 +19,9 @@
 package itdelatrisu.opsu.audio;
 
 import itdelatrisu.opsu.ErrorHandler;
+import itdelatrisu.opsu.Options;
 import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.audio.HitSound.SampleSet;
-import itdelatrisu.opsu.states.Options;
 
 import java.io.IOException;
 import java.net.URL;