rtp: Add MXPEG depayloader
As per the discussion in !5361 (merged) this adds an RTP Depayloader to take the mxpeg payload out of RTP packets, such that it can be consumed by avdec_mxpeg
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As per the discussion in !5361 (merged) this adds an RTP Depayloader to take the mxpeg payload out of RTP packets, such that it can be consumed by avdec_mxpeg