Add Mopidy-Iris for each stream and link to it from main screen panels

[zwometer]

The USP of HydraPlay is switching devices, streams, zones, rooms. And it is great at that. However there are loads of playlist/playback functionalities that it is not capable of (yet). A quick solution for this would be to have HydraPlay as excellent back-end combined with Iris as excellent front-end. In the long run the user will need Iris less and less, as HydraPlay will get more and more features, but this hybrid solution will jump start the system to 100% functionality in no time.

Mopidy-Iris has every front-end functionality one could hope for, so if there was an instance of Iris available for each stream, the user can basically achieve everything they want.
If all they need is already possible with the standard HydraPlay front-end, perfect! But if it isn't, they could use Iris for "advanced music search/playlist management/etc."

On each of the stream panels of HydraPlay there could be a button, that takes the user to the Iris-interface belonging to that stream.
Once a user has set up the current room/device/stream configuration, they will usually stick to controlling what songs are played for some time until they might want to change the stream configuration some time later. So the user would not have to constantly switch between HydraPlay and Iris but rather switch only once in a while.