gst/gst.defs: gst_object_sink is a method of GstObject const of enums is a stupidity (_element_make_from_uri)

Original commit message from CVS:
* gst/gst.defs:
gst_object_sink is a method of GstObject
const of enums is a stupidity (_element_make_from_uri)
* gst/gst.override:
Ignore more functions that have no place in bindings or have better
python equivalents (list filtering for example)
Wrapped gst_version() and gst_type_find_factory_get_list()
* gst/gststructure.override:
More ignores
* gst/gsttaglist.override:
ignore gst_is_tag_list.
* gst/interfaces.override:
wrap gst_mixer_options_get_values()