group: Replace group_no_render by object no_render

group: Replace group_no_render by object no_render

Most of the smart functions "Efl.Canvas.Group.group_xxx" should
not exist and be overrides of the base object function instead.
Cleaning this up is necessary if we want an EO API for custom
smart objects. This patch is the first attempt at removing a
method (the simplest one).

As for no_render, I wonder if propagating to the children
really is necessary. evas_render should skip them already.