VP9 SVC fixes and WebRTC update

0.8.1

Add VP9 SVC support

0.7.0

Add SPM support

0.6.1

Update libmediasoupclient

Update libmediasoupclient version to 3.4.1

Update WebRTC

Update WebRTC version to m120

Implement PC factory customization

0.4.4

Update API for setting ICE transport policy

0.4.2

Explicitly setting producer codec

0.4.1

Implement data channel consumers

0.4.0

Update dependencies

Switch to WebRTC m112