Initial upstream changes for version 0.20.0.
Initial upstream changes for version 0.20.0.

spreedbox-packaging/spreed-webrtc-debian,spreedbox-packaging/spreed-webrtc-debian,spreedbox-packaging/spreed-webrtc-debian,spreedbox-packaging/spreed-webrtc-debian,spreedbox-packaging/spreed-webrtc-debian,spreedbox-packaging/spreed-webrtc-debian