Switch to DisplayableError for the core errors dialog.

Fix users being completely broken.

Switch some more output to events.

Remove Channel from a few commands.

Add a getNickname to Connection.

This should probably be moved to the LocalClient interface when
it exists.

Add a set nickname to Connection.

Move gradle scripts into gradle/

shutdown executor on frame close.

Stop thread bombing when typing.

Fix unit test for coreaboutdialogmodel

Remove mode alias version from the about dialog.

Add support for coverage + coveralls.io.

Use git-version plugin.

Tidying

Switch to new Error Managers.

This is a little bit icky, but I can't see a nicer way to do it.

Tidy up PluginInfo a bit.

Split giant methods up, simplify logic in a few places.

Remove unused methods.

Add a sendmessage to Connection.