orbtk_core: new associated popup functions to render_object
orbtk_core: new associated popup functions to render_object

* get_name(): return placement name
* get_index() retruns placement index

Signed-off-by: Ralf Zerres <a55c5beace021459791f5070a9a90148cd697b8f@networkx.de>

redox-os/orbtk