Using module prefix defeats colorization

[cgay]

dylan-mode highlights macros like with-open-file. If you import file-system with prefix "fs/" (or probably anything else) the highlighting of fs/with-open-file doesn't happen. To solve this I suppose we need a standard module prefix separator. I actually don't like "/" as in "fs/", but it's the one that sucks less than the other available options, in my opinion.

[cgay]

Of course indentation breaks as well.