Native support to generate/parse SDP records.

The JSEP draft spec establishes SDP as the session description format. As far as I can tell, the existing OpenWebRTC SDP record generation & parsing is done in Javascript and is not readily available to native clients. I suggest utilities be added to generate an SDP record from a local session, and parse an sdp record into a remote session.

Thanks,
Joe

Start by reviewing the existing JavaScript SDP record generation and parsing mentioned in the issue, along with the native client interfaces in this C-based framework. Determine how a local session should produce an SDP record and how a remote SDP record should populate a session; done means both utilities are available to native clients.

Written by the indexing model from the issue text.