GUI controls do not update to reflect changes in backend

[Abhishek Mukherjee]

The GUI controls do not change to reflect changes that happen in the backend. For example, changing the value of random_enabled in the backend, does not cause the gui to update the display for the random checkboxes. The effected elements I have seen are:
  * Random
  * Shuffle
  * Volume
Possible others are
  * Dynamic
  * Rating

Steps to reproduce:
  * Enable PythonConsole
  * type `exaile.settings['player/volume'] = 0.2`
  * Note volume slider location
  * type `exaile.settings['player/volume'] = 0.8`

Other setters for testing:
  * exaile.queue.current_playlist.set_random
  * exaile.queue.current_playlist.set_repeat

It was discussed in IRC that this should be implementable in much the way that the gui for Playlist changes automatically when the backend playlist changes

[Steve Dodier-Lazaro (sidi)]

I'm not sure but I think I coded the necessary stuff at least for random / repeat / dynamic and rating when reimplementing some tray icon functions. The Python console won't work here so I can't check, but it'd be cool if you could check it. The volume slider also normally reflects volume changes since the scroll on tray icon was reimplemented.

[reacocard (reacocard)]

It appears all the playback buttons and volume respond to backend changes now. Since rating also appear to respond (ie. changing rating in tray updates rating in pl), i think tis bug can be closed.