GPII-2438: Get the path to the current version of wixtoolset
GPII-2438: Get the path to the current version of wixtoolset

This way, we avoid hardcoding the path to a particular version of Wix.

javihernandez/windows,GPII/windows,javihernandez/windows,gloob/windows,gloob/windows,gloob/windows,gloob/windows,GPII/windows