ocarina: Reset library and right click menu

I added these based on the old library functions.  It seems to be
working so far!

ocarina/library.py

@@ -22,3 +22,23 @@ fill_library()
 def refresh():
 	lib_page.clear()
 	fill_library()
+
+import playlist
+import queue
+
+def clear():
+	queue.clear()
+	playlist.clear()
+	library.reset()
+	lib_page.clear()
+	refresh()
+LIB_PAGE.clear = clear
+
+menu_items = [
+	("Add to Queue", queue.add_to_queue),
+	("Add to Playlist", playlist.add_to_playlist),
+]
+def show_menu(event):
+	m = sources.Menu(lib_page, menu_items)
+	m.show(event)
+lib_page.set_right_click(show_menu)