chore(repo): src/Parsec -> src/comp/Parsec

[thoughtpolice]

This was actually already referred to as such in the COPYING file, so we
might as well clean up the src directory a bit and make that note
accurate.

This also removes the HTML copy of the Parsec license, since I believe
it's simply redundant.

[quark17]

Parsec is now available as a library, so we should eliminate our snapshot (which is old) and update to use the current library. I'd prefer to do that instead of these changes.

[bpfoley]

...and in fact I'm working on that at the moment. I just need to figure out the parsec 2 -> 3 API changes :)

[thoughtpolice]

That's totally fine with me! Unfortunately I can't help remembering the with the Parsec 3 API changes, it happened so long ago my foggy mind has forgotten it all. :)

I'd be more than happy to also help @bpfoley with any "Haskell modernization" attempts like this, e.g. re-using libraries like parsec where appropriate, and cleaning things up to use modern more modern features and libraries. Of course, for now, I'm working on packaging concerns, but this is also a very fruitful thing to do.

However, it'd be useful to think about what the toolchain/dependency requirements are; some dependencies will invariably imply limits on the toolchain and that's probably fine, it's just nice having everyone on the same page.

That should probably happen in a separate issue though. I'll close this one instead!

[bpfoley]

Thank you, I appreciate it. See also #37