Some code cleanup.

- Overhauled OsuTimingPoint class: parsing is done in the constructor, and fields are no longer public.
- Improved consistency of static/non-static fields in a couple of classes.

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

src/itdelatrisu/opsu/states/GameRanking.java

@@ -50,7 +50,7 @@ public class GameRanking extends BasicGameState {
 	/**
 	 * Associated GameScore object.
 	 */
-	private static GameScore score;
+	private GameScore score;
 
 	/**
 	 * "Retry" and "Exit" buttons.