this removes:
 - the bbb properties
 - all explicit mentions of rc3
 - the weird script domain hacks (done via a substitution now)
 - some (few) of the weirder code choices

it also adds some more type level witchery to deal with configs, which
for some reason seems to be the hardest problem of this entire program …

also the server now does inter-assembly dependency checking!

also don't keep adjusted maps around if not necessary

as annoying as yaml is, cabal's package format is somehow worse, apparently

(audio links now have their own allowlist, which won't put things
through the dereferrer)

these now have their own top-level config attribute which is essentially a
shorthand for setting one that's deeper nested.

this allows for creating custom URI "schemas" in the linter's config,
which may be either allowed, prefixed, or translated according to
some (domain-based) substitution.

(these use a rather crude regex for parsing, which may be possible to
side-step, and which should probably be replaced by something that was
actually written while following the relevant rfc)

also yet another typeclass™, because why not?

This got kinda out of hand, but it can now (a) read a json config file
and (b) patch that with another json given on the command line to change
some of the options given in the file.

No, I probably didn't need to make the `patch` function sufficiently
general to work with arbitrary records, but it was kinda fun to do.