Make GroupChatManager listen for channel closing.

Nicer than having Channel poke it explicitly.

Make ErrorManager nullable in ProgramError.

Fix away state dodgyness.

Add a sentry reporting error manager.

Since changing to events we need to fire when changing from
unknown->away. Before, this was handled by the Server being
told about the new message (and then firing listeners).

Fixes #391.

Fix PMD bug.

Fixes #392

Use new formatter for kick events.

Add an app error field to ProgramError.

Replace Channel with GroupChat in a few commands.

Use new formatter for channel nick changes.

Remove saveError method in DiskLoggingErrorManager.

Make formatter load failures a fatal error.

If we can't display any lines, there's not much point carrying on.

Most use logic we don't wrap yet :-/

Add a unit test for ErrorReportingRunnable.

Add a DiskLogging ErrorManager implementation.

Move query self messages to the new formatter.

Weaken Server to Connection in a few places.

Tidy up a little in logger.

Make Query use Connection iface, not Server.

Use new formatter for query action/msg.

Removes some usages of server.parseHostMask which needs to die.

Make Channel use Connection not Server.

Use a semaphore for FED waiting.