add sonos support

it is really a shame that it takes them so long to do this.

i now have a proof of concept implementation that works quite well and i can browse my complete plex music library from the sonos controllers.

but it is tied to my home automation system and not a standalone application so it makes no real sense to publish it here.

but it would not be that hard to do it in node.js for example…

Looks like Sonos community has grown recently :stuck_out_tongue:

just for fun some screenshots of a running PMS/SONOS integration. let’s hope the plex staf will show us at least as much:)

Early 2021 clean-up: implemented