This is Heavily Inspired by the Generic project import wizard.

It basically does what we commonly refer to as "Create a dummy .pro file for
editing stuff in Creator". The result is generally more flexible (project
logic can be added to the .pro) and better supported in Creator (.pro
is first class citizen, the Generic project less so).

The qmake/make build steps are currently generally enabled but are only
expected to work for very simple projects like the typical "one file
example for teaching purposes".

Change-Id: I4976c34d423f256ea9f8f9e569c9783d90f380e3
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>