Listen together

[2br-2b]

It would be really nice (but also a lot of work) to let multiple users (and possibly guests) listen to music together.

My ultimate hope would be something like Spotify's Jams, but even if only one user has control of the queue, this could be a really nice feature!

Even if not, thank you so much for this incredible plugin!

Possibly related to #1103

[paulijar]

I believe that #953 is more or less about the same feature request.