Use only two classifications, bruteforce / spam.

Update module mattn/go-sqlite3 to v1.14.7

See merge request !2

Configure Renovate

See merge request !1

DNSBLs and GeoIP databases.

Still no plumbing that connects them with the actual Server.

This allows us to allocate less, and to export a native type to the
scoring script instead of having to allocate a map[string]interface{}
for the counters.

Reduce the effect of caches within the database layer.

No external values are currently defined or filled in, it's just
defining an "ext" variable placeholder.

The sqlite implementation is more or less as fast (or slow, depending
on how you see it) as the LevelDB one, but it is slightly simpler...