Add license pointer to generated code

Reviewer: @dtalayco

The goal is to allow projects to include the loci/pyloxi source code without needing to prepend a license header to every file. The containing project will need to add a LICENSE.loci or LICENSE.pyloxi file which has the license text.

This change has the side effect of adding ONF/Stanford copyrights to static LOCI files where they weren't present before. If that's a problem we could use a separate copyright template for those files.