rtpfunnel: Also forward custom sticky event

Merged Olivier Crête requested to merge ocrete/gst-plugins-good:webrtc-dscp into master

This is useful to track metadata about each group of packets.

I'm using it to track who is currently sending at libnice to set the DSCP markings based on the sender.

This is used by gst-plugins-bad!1425 (merged)

Edited by Olivier Crête

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