overrides: add a set_caps() method to the Pad override

Merged Antonio Ospite requested to merge (removed):add-Gst.Pad.set_caps into master

The C API provides the gst_pad_set_caps() helper which makes it easier to set caps on pads (see gst/gstcompat.h in gstreamer core).

Add such handy helper to the python bindings too.

The implementation follows as close as possible the one in gstcompat.h with two changes:

  1. the type check on the pad has been removed because self is guaranteed to be a Gst.Pad in python.
  2. the null check on the caps has been extended to be a type check.

Fixes #19 (closed)

Edited by Thibault Saunier

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