GstElement: Add a more flexible way to get request pads.
The new request_new_pad_full vmethod provides an additional caps field, which allows elements to take better decision process. Also, add a gst_element_request_pad() function to allow developers to be able to specify which pad template they want a pad of. Convert gstutils to use that new method instead of the old one when more efficient. This is useful for being able to request pads in a more flexible way, especially when the element can provide pads whose caps depend on runtime configuration and therefore can't provide pre-registered pad templates. API: GstElement::request_new_pad_full API: gst_element_request_pad https://bugzilla.gnome.org/show_bug.cgi?id=637300
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