Make these add the new window to the WindowManager, and post the
relevant event.

SM now listens to frame closing events, so Server doesn't need
to hold on to a reference and inform it that it's closing.

"Death is nothing, but to live defeated and inglorious is to die daily."

Happy new year! :)

Not 100% sure this is a good idea though.

  - Also by AutoValue Topic
  - Also make getUser in Topic Optional

Fixes #280

Pointless now getChannel is optional.

Also remove some more parseHostname calls.

Stab bits of ignored tests that no longer work.

This adds a sendLine method to Connection, which is a bit icky,
but is useful when the end-user is supplying lines to pass
directly to the underlying connection.

This introduces a CachingDocument which wraps around an IRCDocument
and allows UI-specific caching of UI-specific styled lines (so, e.g.
the web UI could cache HTML versions if it wanted).

Also adds a delegating message maker and attributed string maker,
which incorporates the old "make a StyledDoc then change it into
an AttributedString" logic found in ui.core.util.Utils.

Hopefully this should mean all the the swing stuff can be punted
into the swing UI. The delegated maker will also allow colouring
of the new events to be done sensibly, I think.