Danil Chapovalov a28ae40ce2 Restructure format of the video layers allocaton rtp header extension
The newer format is byte aligned and thus faster to write and parse
It also more compact for the common target bitrate cases.

Bug: webrtc:12000
Change-Id: Id040ecb9e7d85799134a6e52f5d6d280b5161262
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/193860
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32669}
2020-11-23 11:36:36 +00:00
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