For now this is just a straight(ish) copy of the way Server worked.
Need to make it use events in the future which should simplify it
quite a bit.

Remove them from the Connection interface.

Will remove them from Connection shortly. Then the functionality
can be pulled out of Server into a sane, separate class.

We now need it to exist independently of anything requesting it,
otherwise we miss lines being added.

This, uh, breaks some channels a little. Will fix in a follow-up.

Add support for Optionals in the event property manager.

Group them by function so the file is a bit easier to navigate.
Use nice syntax for multi-line topic format.

Also add function to do bracketed crazyness for events with reasons.

This isn't used in the UI, and doesn't need to exist with the
individual setter methods.

Issue #284

We no longer need to be consistent with the odd casing/naming
of actions.

These are highlight strings other than the current nickname that
the user wishes to highlight on (e.g. their real name, or 'D*').

We rely fairly heavily on events being ordered consistently, seems
like this is the only way to ensure that.

Everything handled by the event formatter is now soley done
based on that.