WebRTC-Demo-iOS

iOS: Fixed async client to no longer disconnect by using synchronous call to startCapture() and fixed data channel wiring

Server: Always re-send roles when asked if both roles are connected

Async WebRTC: works briefly but iOS side frequently stops transmitting

iOS: Updated to work with new signaling protocol

Server and web client: Changed signaling. Clients indicate readiness and are assigned role when both are present.