Extending ImportPath to work on a directory.
Fixing bug where it was not using the output directory to find the go.mod file.

Added ImportPath function to convert a path to a go source file to an import path. This is useful when generating go source files.

Updating dependencies

Improves verbose logging.
Copy utility routines that may be used by external code now log all copies to the default golang logger.

Updating to latest versions of Go.

Bug fix to make sure copied files also copy their permissions.