#26 more attempts at getting custom step to work.. think now have a way forward.. in wix, set properties for crmado assembly, then grab those in the custom step to update the machine congig file.

see http://blogs.msdn.com/b/heaths/archive/2008/02/08/get-binder-variables-for-assemblies-without-installing-into-the-gac.aspx

and

http://blogs.msdn.com/b/jschaffe/archive/2012/10/23/creating-wix-custom-actions-in-c-and-passing-parameters.aspx