Glyph loading fixes and improvements (for Unicode fonts).

- Glyphs are now loaded for specific fonts as needed, not for all of them at once.  This reduces lag and saves memory.
- Fixed glyphs not being loaded in the downloads menu.
- Moved Utils.loadGlyphs() calls directly above text drawing code (easier to maintain, and fixes a bug with text flickering once).

Also removed MusicController methods 'getTrackName()' and 'getArtistName()' (not needed).

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

src/itdelatrisu/opsu/audio/MusicController.java

@@ -171,24 +171,6 @@ public class MusicController {
 	 */
 	public static OsuFile getOsuFile() { return lastOsu; }
 
-	/**
-	 * Returns the name of the current track.
-	 */
-	public static String getTrackName() {
-		if (!trackExists() || lastOsu == null)
-			return null;
-		return lastOsu.getTitle();
-	}
-
-	/**
-	 * Returns the artist of the current track.
-	 */
-	public static String getArtistName() {
-		if (!trackExists() || lastOsu == null)
-			return null;
-		return lastOsu.getArtist();
-	}
-
 	/**
 	 * Returns true if the current track is playing.
 	 */