Merged with Juanjo code. Extracted webrtc calls from chat. all is handled by videoCall connection. Hangup not implemented yet. Sorry. SAK-23349

git-svn-id: https://source.sakaiproject.org/svn/portal/branches/SAK-23349@123081 66ffb92e-73f9-0310-93c1-f5514f145a0a