PHPCS: enable Direct DB Query sniff
PHPCS: enable Direct DB Query sniff

This was disabled because it gave errors for several different things.
Previously, it wasn’t possible to turn off certain errors. Now each of
the types of errors it gives has a different error code. So now we can
configure it to meet our needs.

Fixes #72

WordPoints/dev-lib,WordPoints/dev-lib,WordPoints/dev-lib