So far, objects had no identification, and both gadgets and namespaces
were called "gadget". qmltyperegistrar, however, is especially
interested in the distinction between namespaces and anything else.
Task-number: QTBUG-68796
Change-Id: Ic5739727bdef7766de6e535c6568920198fadb2b
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>