Support a trusted SHA1 fingerprint to be configured for each IRC server

Defaults the encoding in the DB to latin-1

Add a ChannelOptions table in the DB

And a way to retrieve its values, defaulting on the ServerOptions for unset
values.

Add verifyCert field into the database

Provide username and realname IRC server options

Used in the USER command when connecting to the IRC server, instead of the
first nick.

fix #3028

Add a field (in the configure form) to specifiy an after-connect IRC command

Provide Ports and TLS Ports IRC-server ad-hoc options

This let any user choose which ports to use when connecting to the IRC
server. This also lets the user choose whether or not to force TLS usage (by
setting no non-TLS port).

fix #2731

Introduce an optional Database module

Uses litesql