implement ability to jump by queue position/id

src/ch/blinkenlights/android/vanilla/PlaybackService.java

@@ -1898,4 +1898,19 @@ public final class PlaybackService extends Service
 	{
 		return mTimeline.getLength();
 	}
+	
+	/**
+	 * Returns 'Song' with given id from timeline
+	*/
+	public Song getSongByQueuePosition(int id) {
+		return mTimeline.getSongByQueuePosition(id);
+	}
+	
+	public void jumpToQueuePosition(int id) {
+		pause();
+		mTimeline.setCurrentQueuePosition(id);
+		setCurrentSong(0);
+		play();
+	}
+	
 }

src/ch/blinkenlights/android/vanilla/SongTimeline.java

@@ -557,7 +557,22 @@ public final class SongTimeline {
 		mCurrentPos = pos;
 		mShuffledSongs = null;
 	}
-
+	
+	/**
+	 * Hard-Jump to given queue position
+	*/
+	public Song setCurrentQueuePosition(int pos) {
+		mCurrentPos = pos;
+		return getSong(0);
+	}
+	
+	/**
+	 * Returns 'Song' at given position in queue
+	*/
+	public Song getSongByQueuePosition(int id) {
+		return mSongs.get(id);
+	}
+	
 	/**
 	 * Move to the next or previous song or album.
 	 *