WebRTC/ORTC support for peer to peer messaging

[lwansbrough]

One of the biggest things missing from HoloLens right now is a good system for doing P2P messaging. Even on the Unity side, there's a lack of clear support for direct communication between HoloLenses. IIRC it requires the sharing service, which would be more akin to web sockets in JS. It also requires setting up a server, whereas with WebRTC you just need a STUN service.

It would be great if this middleware provided the WebRTC and/or ORTC APIs so we could build P2P libraries for our apps. Perhaps even a few high level P2P services could be created for generic tasks: sharing location/orientation data between multiple devices and generic binary/text messaging between devices.