[mpris] Playlist extension observations

[Conor Curran]

I just did some research on the vala dbus async api. It looks as if the 
good vala people have taken care of the async behaviour. Therefore the 
GetPlaylists can pretty much stay the same.

So the revised list of modifications needed are now :

    * A new method GetCurrentPlaylist should be added. This would be
      useful for clients that come up and down and hence need to query
      the server (media player) when starting up to sync properly. If
      there is no active playlist, it should return a PlaylistDetail
      with each member set to null ?
    * A new signal to inform that the current active playlist has
      changed. This would allow for a proper MVC pattern.
          o This could also cover the situation where the playlist has
            ended and no other playlist has begun in which case the
            returned playlist details struct should contain null members.

That should do it.

Good weekend all.
C

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