Tracks whether an Endpoint is in any other Endpoint's lastN and sends data channel messages.
jitsi/libjitsi commit 4bc1eb6b66140853e0dead0e86c217899228a091: Furthers the support for preserving Buffer flags between libjitsi's network and FMJ's media layers. Does not decrypt the video sent by endoints who are not in any endpoint's 'last n'.