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/states/SongMenu.java

@@ -465,7 +465,8 @@ public class SongMenu extends BasicGameState {
 	public void update(GameContainer container, StateBasedGame game, int delta)
 			throws SlickException {
 		UI.update(delta);
-		MusicController.loopTrackIfEnded(true);
+		if (reloadThread == null)
+			MusicController.loopTrackIfEnded(true);
 		int mouseX = input.getMouseX(), mouseY = input.getMouseY();
 		UI.getBackButton().hoverUpdate(delta, mouseX, mouseY);
 		selectModsButton.hoverUpdate(delta, mouseX, mouseY);