resip/stack: WebRTC: added basic Cookie class
resip/stack: WebRTC: added WsConnectionValidator abstract base class
resip/stack: WebRTC: add support for cookie parsing and validation at connection time
repro: WebRTC: implement BasicWsConnectionValidator class
resip/stack: WebRTC: update WebSocket related constructors to use the WsConnectionValidator class
resip/stack: WebRTC: use typedef for Cookie container
repro: WebRTC: add BasicConnectionValidator instance to WebSocket transports