Add way to name files as a part of a module

[Temperz87]

Say someone creates a file named "deduce-linked-list-lab.pf". There is now no way to import that file, as the parser sees the dash in the name and interprets it as something else. It'd be nice if instead we could say something like "Module LinkedListLab" at the top of the file and then say "import LinkedListLab" and have it work out.

I also just realized while typing this that some people call these namespaces, but who am I to judge.

[mateidragony]

Another solution could be to change the parser to allow dashes or maybe denote "special" file names with quotes or angle brackets or something