Change texture_*_cogl_texture to use the new handle.
Change texture_*_cogl_texture to use the new handle.

Make use of the new cogl.Texture handle in
_wrap_clutter_texture_*_cogl_texture

pmarti/pyclutter,pmarti/pyclutter,pmarti/pyclutter,GNOME/pyclutter,pmarti/pyclutter,GNOME/pyclutter