OP25 browser audio

[boatbod]

Thanks to k4jk, op25 boatbod now has long awaited browser audio capability when running multi_rx with the new ui. Behind the scenes, websockets are used as the transport, and it is entirely possible to configure a websocket stream in parallel with either local audio or an icecast/liquidsoap stream. There may well be a few kinks and tweaks needed, but it's good enough to get started. Feedback to this post in the github repo please.

Read more about it in the ~/op25/README-browser-audio.md file in the repo.