Adjustments to CallId, EraId, RingId and derivations/conversions

Group Calls: Limit bitrate for the lowest layer

Reference signalapp/webrtc@5481b
  - VideoAdapter: Fix scaling of very large frames
  - Log more info when video input starts

Reference signalapp/webrtc@5481a
  - Set inactive timeout to 30s
  - rffi: Set a bandwidth limit on the lowest layer of a group call
  - Allow tcp candidates in group calls

Log notebook improvements

Build improvements