Refactor the sslqueries mode handler.•••This fixes a rare desync where a server with the sslmodes module
but without the sslinfo module could desync when a remote user on
a server with both enables the sslqueries mode.
Tidy up keywords on module methods.•••- Remove virtual keyword from a ton of methods which don't need it.
- Add override keyword to a ton of methods which do need it.