Dagger 2.0 appears to require each method in a module to have a
unique name. In some cases we've used overloads with the same name.

Also, remove a bunch of boilerplate javadoc.

Issue #601

We were raising notices as all coming from the local user, not
the person that sent the notice. This is... unideal.

We don't need to reregister on nick change now, as we get all
the events anyway and filter them manually.

The "old" profiles were pre 0.6.3m1 - if anyone upgrades from that
long ago they'll just lose their profiles.

Stop the InputHandler running off to the global command manager for
commands - instead get them from the command parser it's associated
with.

Fixes #47

For some reason we're checking hostname (e.g. dmdirc.com)
against full hosts (e.g. chris!ident@dmdirc.com) and expecting
them to match.

Queries now check on nicknames.

This keeps happening, and I don't know why we try to unwrap twice.
Probably only makes sense for certain exception types...

Stop ChannelListModesRetrieved being displayable - not sure
why it ever was, we don't have a formatter for it.