~sirn/fanboi2

chore: replace gunicorn with waitress again
chore: relicense to AGPLv3

Any changes before this commit are still considered BSD-3-Clause.
templates: display ident_v6 as ID6
services/post: add ident_v6 for ipv6 support
filters/proxy: skip proxy check for ipv6
filters/dnsbl: support ipv6
chore: update vagrant bootstrap
chore: fix build failure due to python version change
chore: disable build until 20q1 provision
chore: update deps to latest version
[build] create venv before building
[build] update deps, add python-language-server
[build] mirror to github
[build] also include alembic.ini in sdist
[cmd/deploy] switch fbdeploy to use python -m venv
[services/scope] inline STRING_INNER

The implementation changed in newer Lark version.
[chore] fix compatibility with pyramid 1.5+
[chore] add black and flake8 to dev dependencies
[worker] downgrade kombu to ~4.3 for compat with older redis
[doc] fix dev assets build instruction
[doc] add detailed setup instructions for freebsd
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