man: rewrite in Nim

Depending on Perl just for this is silly.

Now we use libregexp for filtering basically the same things as
w3mman2html did. This required another patch to QuickJS to avoid
pulling in the entire JS engine, but in return, we can now run regexes
without a dummy JS context global variable.

Also, man.nim now tries to find a man command on the system even if it's
not in /usr/bin/man.

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