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rtpulpfecdec: Implement Microsoft extensions

Olivier Crête requested to merge ocrete/gst-plugins-good:rtpulpfec-msft-extension into master

Microsoft has a slightly difference variant. In particular, they ignore RTP header extensions when doing FEC and the sequence number is stored as an offset instead of as the complete number. They also add an extension to the FEC header itself.

Only the XOR variant is implemented. The MS-H264PF document hints at a Reed-Solomon based variant, but doesn't explain it.

Ref: MS-H264PF https://docs.microsoft.com/en-us/openspecs/office_protocols/ms-h264pf/ab2ee1d8-ce1b-46f3-b128-9751256b6f18

cc: @fludkov

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