Update gradle to 2.11.

Update DMDirc repo to HTTPS.

Convert events to use new date APIs.

Java 8 introduces a sane API for dates; to store datettimes
we should now be using LocalDateTime.

Update plugins after core event changes.

Separate InputModel functions from FrameContainer.

Remove input methods from WindowModel.

Migrate all users to using the InputModel.

Remove FrameContainer parent/child fields.

Remove usages of FrameContainer window methods.

These will be going away shortly.

Remove unused methods/fields.

Migrate DCC plugin to use events.

Migrate debug plugin to showOutput/showError.

Remove unused method.

Use events for some more plugin outputs.

This slightly changes how the logging plugin history window
works - instead of parsing dates and using DMDirc timestamps,
it just shows the logged timestamp like the backbuffer does.

As history tends to span several days this seems more useful.

Issue DMDirc/DMDirc#426

Fix systray plugin

Use events for raw data in/out.

Systray plugin was attempting to set the visibility of the main
window on the EDT, do this off the EDT.

Issue DMDirc/DMDirc#426

Switch some more plugins to use new events.

DMDirc/DMDirc#426

Make logging plugin use new events.

DMDirc/DMDirc#426

Fix some build warnings.

Add snapshot repository.

Because plugins depends on client, they need to be able to
find the client's transitive dependencies as well.

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.