Plugin support for core changes.

With the removal of message sinks, the active window plugin has
nothing to do now. We can reimplement it much more simply
directly as part of the Swing UI.

Remove most deprecated methods in commands

Support for core changes.

Support for core topic date changes.

Pass initial window state to new clients.

This adds an 'initial state producer' to create the burst of
state clients will receive on connect, and serialisers for
WindowModels and BackBuffers.

Add a controller for websockets.

The handler can't be dependency injected (as it's created by the
framework) so, in order to minimise the amount of static
horribleness, pass in a controller which can do the actual work
and have proper dependencies.

Add basic websocket handler.

web2: Add dagger module, make port configurable.

Skeleton web UI plugin.

Now with working dependencies and webserver.

Add skeleton files for new web UI plugin.

Textpane background opacity

Add a title to the perform dialog

Also fix an invalid default option for the "background option"

Bump gradle version.

Refresh plugins when downloading a new one.

Don't try to add it based on path, just get the PluginManager
to refresh everything.

Fix fake errors not being reportable.

SLF4J some more logging statements in the Swing UI.

Fix for core UpdaterChecker changes.

SLF4J Logging in the Swing UI.

Add SerialVersionUID to GlobalAutoCommandDialog.

SLF4J some more plugins.