[Bug 791453] videocrop: Add GstVideoCropMeta support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #11 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 365512
  --> https://bugzilla.gnome.org/attachment.cgi?id=365512&action=edit
basetransform: Allow going passthrough inside decide_allocation

Sub-class may want to decide to go passthrough/in-place by inspecting
the support meta APIs. This patch duplicates the check for this mode,
so we still don't do uneeded allocation query while we allow sub-classes
to switch the behaviour during it's own decide_allocation call.

Notice that such sub-class need to reset the class to non-passthrough in
set_caps() in order for decide_allocation to be called again. This is
needed otherwise we'd be doing an allocation query in element in which
it make no sense (notably capsfilter).

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