Minor style fixes

Use new config annotations

Rename custom jar and test tasks in plugins.

IDEA gets super confused when you take a jar task and make it not a jar task.
These are only really used when running from CI (running `./gradlew jar` in
meta will still trigger all of the `:plugin:XXX:jar` tasks), so the names don't
matter.

Update dependencies.

(Depends on MBassador version bump in core)

Update gradle to 3.1.

Fix maven URL and dependencies.

Accessing 'repo' is bad practice and disabled in newer artifactory
versions (like the one we just deployed). Rely on releases instead.

Also, the identd plugin was depending on the wrong parser, and
was presumably pulling in criminally old versions from artifactory.

Support for core control code changes.

Fix HistoryWindowTest compilation.

Support for core changes.

Remove external usagees of ConfigSource.

Use EventBus interface.

This is an implementation detail, and it doesn't make sense to
expose it in an interface for everyone to access. The only use
of it outside of the config system is in debug displays.

This is just an IntelliJ refactor, using EventBus in place of
DMDircMBassador whenever possible.

Fix swing_ui after query change.

Explicitly pass event bus in to a few places.

Use PrivateChat not Query in contactlist.

Fix LoggingManager after event change.

Fix layout issue from MigLayout update

The mainframe just laid out really badly, splitpane didn't grow, the
statusbar was underneath things.

Stop using Window and InputWindow.

These interfaces are basically pointless.

Remove some uses of Window.

Window only has a getContainer() method, so we may as well just
pass a WindowModel around instead.

Make the WebSocketController subscribe to events.

Web UI work.

- Pass in ID
- Don't burst the full backbuffer

Spark doesn't work with recent versions, old versions of Jetty
have nasty bugs, and spark doesn't really give us much benefit.

Allow anything in a sub-directory, such as services. This greatly
simplifies embedding complex software such as Jetty.

Add a 'provided' scope.

This prevents DMDirc's transitive dependencies from being bundled
in plugins. e.g. DMDirc includes SLF4J, so any plugin that depends
on it (or depends on another project that depends on SLF4J) should
not include it in the plugin jar to avoid having duplicate classes
from different class loaders.