[Qt-creator] Python support in 4.9

[Jason H]

With QtC at RC1, I'm still looking for answers to these questions:

> 1. it looks like there isn't a way to import an existing python project?
> 1a. With an existing project how do I configure a .pyproject file, including specify the file with main / QApplication / entry point?

> 4. Unfortunately all python projects will be called "main" in the project explorer.
> Maybe the entry point should be $1.py where $1 is the name of the directory? i.e. test_pythonwindow (see attached)

> 5. How do I specify python3 for a project? It seems to default to python 2?

I think regular users will have similar ones.