Change Jitsi rooms without rebuilding Jitsi element/reconnecting

[seangibat]

Right now we're recreating the Jitsi element and reconnecting to Jitsi on each render (room change). See: app/client/jsx/JitsiVideo.jsx

If we can keep the Jitsi element, but tell it to change rooms, the user experience would be a lot more fluid.

This might not be possible. I looked into it a bit and didn't find anything.

It'll probably take diving into the source of the Jitsi library: https://github.com/jitsi/lib-jitsi-meet