code: public List<Message> requestPlaylistMenuFrom(final SlotReference slotReference, final int sortOrder)
              throws Exception {
  
          return MetadataFinder.getInstance().requestPlaylistItemsFrom(slotReference.player, slotReference.slot, sortOrder,
                  0, true);
      }
docs: Ask the specified player for a Playlist menu. This boils down to a call to
  {@link MetadataFinder#requestPlaylistItemsFrom(int, CdjStatus.TrackSourceSlot, int, int, boolean)} asking for
  the playlist folder with ID 0, but it is also made available here since this is likely where people will be
  looking for the capability. To get the contents of individual playlists or sub-folders, pass the playlist or
  folder ID obtained by calling this to that function.
  
  @param slotReference the player and slot for which the menu is desired
  @param sortOrder the order in which responses should be sorted, 0 for default, see Section 6.11.1 of the
  <a href="https://github.com/Deep-Symmetry/dysentery/blob/master/doc/Analysis.pdf">Packet Analysis
  document</a> for details
  
  @return the playlists and folders in the playlist menu
  
  @see MetadataFinder#requestPlaylistItemsFrom(int, CdjStatus.TrackSourceSlot, int, int, boolean)
  
  @throws Exception if there is a problem obtaining the menu