Continuation of 53c79c5 - HitObject name changes.

Attempts to eliminate any confusion between OsuHitObject (raw, parsed hit objects) and HitObject (interface for game object types).
- Renamed "HitObject" interface to "GameObject", since these objects are specific to gameplay.
- Renamed "OsuHitObject" to "HitObject", since these objects are primarily containers for parsed data.

Sorry if the name-swapping is confusing; these should be better names in the long run.

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

src/itdelatrisu/opsu/Utils.java

@@ -20,7 +20,7 @@ package itdelatrisu.opsu;
 
 import itdelatrisu.opsu.audio.SoundController;
 import itdelatrisu.opsu.audio.SoundEffect;
-import itdelatrisu.opsu.beatmap.OsuHitObject;
+import itdelatrisu.opsu.beatmap.HitObject;
 import itdelatrisu.opsu.downloads.Download;
 import itdelatrisu.opsu.downloads.DownloadNode;
 import itdelatrisu.opsu.replay.PlaybackSpeed;
@@ -191,7 +191,7 @@ public class Utils {
 		PlaybackSpeed.init(width, height);
 
 		// initialize hit objects
-		OsuHitObject.init(width, height);
+		HitObject.init(width, height);
 
 		// initialize download nodes
 		DownloadNode.init(width, height);