Split and move various setup.py parts into different files

This is an initial effort to clean up setup.py.
A new directory called build_scripts contains most of the logic for
building, leaving setup.py as an entry point.

The build_scripts directory contains the usual qtinfo, utils, and the
setup.py content has been split into main.py and platform specific
files under platforms subfolder.

The testrunner script has been modified to find the new location of
the utils module.

Task-number: PYSIDE-558
Change-Id: I3e041d5116ca5c3f96c789317303b65a7b1bbd70
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

0 files changed, 0 insertions, 0 deletions