[Bug 791453] videocrop: Add GstVideoCropMeta support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
So I just changed my mind ;-P And added a new virtual method to
GstBaseTransform, that's make the code straightforward. Now time to do what we
all like to do, decide if that new method name is correct.

  GstBaseTransform::decide_meta

I'm not yet convince to be fair, I didn't think about it much. I feel like it's
not really deciding metas but in fact deciding base on the meta. For now, it's
being used for passthrough/in-place decision, it's likely the only use case, as
for anything not going passthrough or in-place, we can read that information
from decide_allocation.

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