* ov-room to ov-session
* ov-participant to ov-stream
* ov-chat to ov-chat-panel
* ov-participant-panel to ov-participants-panel
* ConnectionWrapper to StreamModel
- Commented not necessary code in user-settings which forced a new publisher init if device labels were empty
- Added more conditional cases initializing the default publisher in webrtc service
- Added video background color