Housekeeping

• Update dependencies and weed them out a bit. We now use https://github.com/adobe-type-tools/cffsubr/ instead of pulling in the entire AFDKO just to compress the fonts.
• Update the bundled instantiator.py module to latest upstream.
• Make sure we subroutinize after psautohint. This wasn't done before, and now the static fonts are roughly half the size.