The event is triggered when Jicofo sends 'session-terminate' and our
PeerConnection is closed.

Fix broken variable

This is an unrecoverable error and in current state of
the system reload in the client is the least complex
thing to do.

Moves render time calculations in the library.

Adds events for various disconnects, failures and reloads.

Leaves conference when kicked, to clear listeners and timers like statistics. We need room to be non present in order to remove local tracks and avoid sending iq for track remove.