* ref(SDP) Convert to ES6 class.
* ref(SDP) Use enum for URNs associated with XMPP extensions.
* ref(XMPP) Replace more XEP URN constants with enum.
* fix(RTC) Fixes mediaType lookup based on source-name.
Remove support for legacy endpoint based signaling. (#2147)
* Remove support for legacy endpoint based signaling and make source-name signaling as the only signaling mode. The legacy screensharing mode will no longer be supported. The client will still be able to process remote presence sent in the old format to support interop with very old mobile clients and jigasi that do not support source-name signaling.
* remove code related to presenter mode.