Issue #750

Mockito now errors if a mock is unnecessary, plus a few other minor
API changes.

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

Stop swimming against the tide and accept what most of the rest of
the world does.

While it adds an annoying depth to the actual source code, it makes
the root directory nicer (no more 'test-res' dirs), means we don't
have to override the gradle config, and makes it nicer to work in
IDEA 2016.1.

Migrate all users to using the InputModel.

Change-Id: Id9e68a94dc0b42b3fc4450154e2e2e71807a88c1
Reviewed-on: http://gerrit.dmdirc.com/3516
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>