Fixed crashes when importing beatmaps (due to more async issues).

Don't call MusicController.loopTrackIfEnded() if a beatmap reloading thread is running.

Other changes:
- Fixed issue where long download result text would be drawn outside the result area by adding a clip.
- Changed default music offset from -150ms to -75ms.

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

src/itdelatrisu/opsu/Options.java

@@ -179,7 +179,7 @@ public class Options {
 		},
 		EFFECT_VOLUME ("Effect Volume", "Volume of menu and game sounds.", 70, 0, 100),
 		HITSOUND_VOLUME ("Hit Sound Volume", "Volume of hit sounds.", 30, 0, 100),
-		MUSIC_OFFSET ("Music Offset", "Adjust this value if hit objects are out of sync.", -150, -500, 500) {
+		MUSIC_OFFSET ("Music Offset", "Adjust this value if hit objects are out of sync.", -75, -500, 500) {
 			@Override
 			public String getValueString() { return String.format("%dms", val); }
 		},