[Bug 791453] videocrop: Add GstVideoCropMeta support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791453

--- Comment #14 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
This revision does not introduce a new API anymore. The only side effect is
that to get decide_allocation to be called upon renegotiation, the sub-class
must reset passthrough/in-place to FALSE. Not a big deal, but clearly something
we might forget about often, and which does not immediately causes issues.

And before you ask, I already thought about just moving the checks, but then
you get an allocation query in capsfilter, which is not causing any issues, but
isn't nice.

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