Added all the provisioning scripts that install required
programs and make changes to certain settings. These are needed to
build qt5. This replaces the old Windows 8 template.
Made all the Windows platforms use the scripts under
provisioning/common/ instead of duplicate files.
Task-number: QTQAINFRA-1357
Change-Id: Ic3f0b50079b212437fff711379f243753ab84872
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
