Stab bits of ignored tests that no longer work.

Really minor tidying.

Use forEach where possible.

Add a UserFactory and an implementation.

Remove more usages of Server.

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.

Add User + GroupChatUser objects.

Remove some more Server useages.

Change to Connection in ExternalCommands.

Switch to Executors from TimerTasks.

Fix Away Messages.

Camel case ServerInviteReceivedEvent

Tidy up away states in Connection.

Separate most swing logic from core model.

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.

Remove deprecated method.

Remove StyledDocument stuff from styliser.

Put it behind a nice interface, so the styliser can work without it
and be tested, and other UIs don't have to use swing junk.

Remove get/set ActionManager methods.

Stop installActionPack method being static.

Stop using ActionManager.getActionManager

Store display properties in Line.

Push more parser config into the factory.

Remover CertProblemListener.