Add a plex plugin

[phil-d-wilson]

For people who don't use online services for music, and use a local plex server.

[allordacia]

Would also love to see an integration that worked with a local network storage option. I have been trying to get Volumio to work with Balena but it does not seem like it will end up being a viable option.

[Syco54645]

This would be quite nice and would allow for something akin to airplay for Android (Plex) users.

[anatosun]

It seems that remote control has been (re)introduced into Plexamp 4.0. That means that Plexamp can now act as a Plex audio receiver. This could be an interesting lead as to how to implement this feature.

UPDATE: I managed to make this work through the instructions given in this release thread. I'm not exactly sure how to build this into balena Sound however.