Minor graphical updates and code cleaning.

- Padded game score display, and always display 2 digits in front of the decimal (e.g. 00.00% instead of 0.00%).
- Keep map progress circle at a fixed location instead of basing it off the score length.
- Moved some track resets (pause + restart at preview) to trigger upon loading the song menu.  Fixes weird behaviors when leaving the game state.
- Cleaned up trailing whitespace and added missing overrides.

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

src/itdelatrisu/opsu/states/MainMenuExit.java

@@ -130,7 +130,7 @@ public class MainMenuExit extends BasicGameState {
 
 	@Override
 	public void mousePressed(int button, int x, int y) {
-		// check mouse button 
+		// check mouse button
 		if (button != Input.MOUSE_LEFT_BUTTON)
 			return;