Enable use of wildcard expressions in exclude file

Due to the widespread use of git, I would find it much more intuitive if .rat-excludes worked like .gitignore. I think most people on the Spark project would agree (though, fair disclosure, I haven't polled them).

Would it make sense to add a CLI option instructing RAT to interpret entries in the exclude file as wildcard expressions (as opposed to regular expressions) that work more or less like .gitignore?

This feature request is somewhat related to RAT-265.