[Bug 791453] videocrop: Add GstVideoCropMeta support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 365399
  --> https://bugzilla.gnome.org/attachment.cgi?id=365399&action=edit
basetransform: Introduce decide_meta virtual function

This virtual function is useful for sub-class that needs to decide
if they are going to do passthrough or in-place transformation base
on the supported meta API discovered through the allocation query.

When this virtual method is set, the GstBaseTransform will first perform
an allocation without requesting a pool. Then, if the element is
neither passthrough or in-place, it will perform a normal allocation
query and call decide_allocation() as usual.

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