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/Utils.java

@@ -59,7 +59,8 @@ public class Utils {
 		COLOR_GREEN_OBJECT    = new Color(26, 207, 26),
 		COLOR_BLUE_OBJECT     = new Color(46, 136, 248),
 		COLOR_RED_OBJECT      = new Color(243, 48, 77),
-		COLOR_ORANGE_OBJECT   = new Color(255, 200, 32);
+		COLOR_ORANGE_OBJECT   = new Color(255, 200, 32),
+		COLOR_YELLOW_ALPHA    = new Color(255, 255, 0, 0.4f);
 
 	/**
 	 * The default map colors, used when a map does not provide custom colors.