Major refactoring - now using far more logical class names.

- Renamed "OsuFile" to "Beatmap".  All related variables and methods with "osu" have also been renamed to "beatmap" (or variants of each).
- Renamed "OsuGroupNode" to "BeatmapSetNode".  Avoids confusion since groups are identified by a "set ID", not a "group ID".
- Renamed "OsuGroupList" to "BeatmapSetList", for the same reason as above.
- Renamed "OsuDB" to "BeatmapDB", for the same reason as above.
- Moved classes directly related to parsed beatmaps (Beatmap, BeatmapSetList, BeatmapSetNode, OsuHitObject, and TimingPoint) into a new "beatmap" package.

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

src/itdelatrisu/opsu/objects/Circle.java

@@ -22,8 +22,8 @@ import itdelatrisu.opsu.GameData;
 import itdelatrisu.opsu.GameData.HitObjectType;
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.GameMod;
-import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 import itdelatrisu.opsu.states.Game;
 
 import org.newdawn.slick.Color;

src/itdelatrisu/opsu/objects/DummyObject.java

@@ -18,7 +18,7 @@
 
 package itdelatrisu.opsu.objects;
 
-import itdelatrisu.opsu.OsuHitObject;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import org.newdawn.slick.Graphics;
 

src/itdelatrisu/opsu/objects/Slider.java

@@ -22,9 +22,9 @@ import itdelatrisu.opsu.GameData;
 import itdelatrisu.opsu.GameData.HitObjectType;
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.GameMod;
-import itdelatrisu.opsu.OsuFile;
-import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.beatmap.Beatmap;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 import itdelatrisu.opsu.objects.curves.CatmullCurve;
 import itdelatrisu.opsu.objects.curves.CircumscribedCircle;
 import itdelatrisu.opsu.objects.curves.Curve;
@@ -104,9 +104,9 @@ public class Slider implements HitObject {
 	 * Initializes the Slider data type with images and dimensions.
 	 * @param container the game container
 	 * @param circleSize the map's circleSize value
-	 * @param osu the associated OsuFile object
+	 * @param beatmap the associated beatmap
 	 */
-	public static void init(GameContainer container, float circleSize, OsuFile osu) {
+	public static void init(GameContainer container, float circleSize, Beatmap beatmap) {
 		containerWidth = container.getWidth();
 		containerHeight = container.getHeight();
 
@@ -126,8 +126,8 @@ public class Slider implements HitObject {
 		GameImage.REVERSEARROW.setImage(GameImage.REVERSEARROW.getImage().getScaledCopy(diameter, diameter));
 		GameImage.SLIDER_TICK.setImage(GameImage.SLIDER_TICK.getImage().getScaledCopy(diameter / 4, diameter / 4));
 
-		sliderMultiplier = osu.sliderMultiplier;
-		sliderTickRate = osu.sliderTickRate;
+		sliderMultiplier = beatmap.sliderMultiplier;
+		sliderTickRate = beatmap.sliderTickRate;
 	}
 
 	/**

src/itdelatrisu/opsu/objects/Spinner.java

@@ -22,10 +22,10 @@ import itdelatrisu.opsu.GameData;
 import itdelatrisu.opsu.GameData.HitObjectType;
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.GameMod;
-import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.Utils;
 import itdelatrisu.opsu.audio.SoundController;
 import itdelatrisu.opsu.audio.SoundEffect;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 import itdelatrisu.opsu.states.Game;
 
 import org.newdawn.slick.Color;

src/itdelatrisu/opsu/objects/curves/CatmullCurve.java

@@ -19,7 +19,7 @@
 package itdelatrisu.opsu.objects.curves;
 
 import itdelatrisu.opsu.ErrorHandler;
-import itdelatrisu.opsu.OsuHitObject;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import java.util.LinkedList;
 

src/itdelatrisu/opsu/objects/curves/CircumscribedCircle.java

@@ -19,7 +19,7 @@
 package itdelatrisu.opsu.objects.curves;
 
 import itdelatrisu.opsu.ErrorHandler;
-import itdelatrisu.opsu.OsuHitObject;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import org.newdawn.slick.Color;
 

src/itdelatrisu/opsu/objects/curves/Curve.java

@@ -19,8 +19,8 @@
 package itdelatrisu.opsu.objects.curves;
 
 import itdelatrisu.opsu.GameImage;
-import itdelatrisu.opsu.OsuHitObject;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import org.newdawn.slick.Color;
 import org.newdawn.slick.Image;

src/itdelatrisu/opsu/objects/curves/EqualDistanceMultiCurve.java

@@ -18,7 +18,7 @@
 
 package itdelatrisu.opsu.objects.curves;
 
-import itdelatrisu.opsu.OsuHitObject;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import java.util.Iterator;
 import java.util.LinkedList;

src/itdelatrisu/opsu/objects/curves/LinearBezier.java

@@ -18,7 +18,7 @@
 
 package itdelatrisu.opsu.objects.curves;
 
-import itdelatrisu.opsu.OsuHitObject;
+import itdelatrisu.opsu.beatmap.OsuHitObject;
 
 import java.util.LinkedList;