GstRTPAudioLevelMeta, implementation of RFC6464

Håvard Graff requested to merge hgr/gst-plugins-base:audio-level-id into master

Tagging RTP-buffers with audio-level and a speaker-indication is very useful in switching architectures, when you want to make decisions of which audio and/or video streams to forward. This patch can take a GstRTPAudioLevelMeta and transfer that as an RTP-header extension with the payloader, and similarly take the header-extension and transform it into a GstRTPAudioLevelMeta in the depayloader.

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