- new class 'DesignStudio' to handle Design Studio projects. - Currently uses a way of monkey patching to override the 'main.py' to use 'main_patch.py' which has the same content but with 'app_dir' set to the parent of `main.py``. The reason for doing this is that Nuitka requires the `main.py` to be in the same directory as other resources required for the project. Once the corresponding patch, to alternate between evaluating 'app_dir' based on whether the application is deployed or called through the Python interpreter, is merged then this temporary fix of creating 'main_patch.py' can be removed. - Add tests. Pick-to: 6.7 Change-Id: I79e6572bdbbf4576fbdd9039a4922997a22139f8 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>