BUG: Update ModuleWizard to support *.cmake file

This will allow to successfully use the wizard against the
SuperBuild extension template.

Co-authored-by: Marine Clogenson <marine.clogenson@epfl.ch>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22105 3bd1e089-480b-0410-8dfb-8563597acbee