[Bug 791918] Add KLV meta and add support for it in matroska mux/demux

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791918
Bug 791918 depends on bug 791415, which changed state.

Bug 791415 Summary: buffer: store sequence number for metas
https://bugzilla.gnome.org/show_bug.cgi?id=791415

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

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