Make promoe work with DrDolittle.

This moves the c++ wrapper into promoe so we don't depend on a patched
version of xmms2 anymore. You should be able to run this with a drdolittle
out of the box. I also disabled the medialib browser for future enabling.

PlaylistList.h

@@ -37,6 +37,7 @@ class PlaylistList : public QWidget {
 		void sizeChanged (QSize);
 	
 	private:
+		void showMenu (void);
 		void paintEvent (QPaintEvent *event);
 		void mousePressEvent (QMouseEvent *event);
 		void mouseMoveEvent (QMouseEvent *event);