TODO: A way to see the path of the currently selected item in any grouplike
      element. Each item in the path should be a button that, when pressed,
      makes the MAIN grouplike view navigate there.

TODO: A "shuffle queue" button!

TODO: A "clear queue" button.

TODO: A way to jump to an item with a particular name. Probably press "/".
      It'd be nice if the closest match got highlighted while you were typing.

TODO: "Queue to play next"... maybe also a cursor in the queue list, which
      would tell after what track to place newly-queued items?