Initial import of Qt3DCore and Renderer aspect

For now the renderer aspect is still compiled into the Qt3DCore library.
This needs to be split out into a plugin so it can be loaded
dynamically along with other future aspects.

Change-Id: Iba8402b35c7ebc1c503d438c87aad77f5fef2261
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>