Major track length-related updates.

- Parse and store the end time for every beatmap (i.e. end time of last hit object).
- Added a 'length' sorting tab.
- Added 'length' search condition.
- Removed 'getTrackLength()' and 'getTrackLengthString()' methods, as they are no longer needed.
- Added a loader spritesheet animation to render during MP3 conversions (in place of track length rendering upon completion).

Other changes:
- Added a yellow progress circle during lead-in time.
- Fixed sorting tab positioning.
- Slightly increased button animation speed in "Main Menu Exit" state.

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

src/itdelatrisu/opsu/states/MainMenuExit.java

@@ -120,9 +120,9 @@ public class MainMenuExit extends BasicGameState {
 		float yesX = yesButton.getX(), noX = noButton.getX();
 		float center = container.getWidth() / 2f;
 		if (yesX < center)
-			yesButton.setX(Math.min(yesX + (delta / 6f), center));
+			yesButton.setX(Math.min(yesX + (delta / 5f), center));
 		if (noX > center)
-			noButton.setX(Math.max(noX - (delta / 6f), center));
+			noButton.setX(Math.max(noX - (delta / 5f), center));
 	}
 
 	@Override