[Development] Stand alone scene graph module

[Dmitrii Volosnykh]

Hi, Gunnar.

At first glance scenegraph module and Qt3D have similar feature sets.
In what relations are they? As scenegraph depends on QtQuick and Qt3D
is the part of the former one I may guess that scenegraph depends
indirectly on Qt3D, but you mentioned that it now depends only on
QtCore and QtGui... Could you please elaborate on this? How these two
similar in functionality modules are planned to co-exist in Qt
framework as a whole?

Regards,
Dmitrii.