Allow selecting a random new playlist via service

[GeertvanHorrik]

First of all, because of this integration I got interested in Meural and am a very happy user for a few years now :-) Thank you very much for creating this integration.

Reason

We have "many" playlists on our canvas. The downside of the playlists is that they can sometimes be beautiful and boring at the same time. For example, when going through 32 planets, after 6 we would like to see a different one. Ultimately, we would like the Meurals to shuffle between playlists and images (but I couldn't find settings that can do this, only shuffle images inside a playlist).

Description

It would be great if we could select a random playlist, or even a random item. I checked the source, it is possible to browse galleries, but this is not exposed via a service? I think there could be a service call play_random_item that picks a random gallery and random image to play. Not sure about the performance of switching playlists though.

[GuySie]

Thanks! Switching to a random playlist should not be too difficult to add. Let me look into it.