Issue #750

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.

We'll use this to decide whether to auto-rejoin or not.

Issue #677

(This depends on a plugins change)

These are just proxies to ChannelInfo for now.

Doesn't make sense to have this any more, as Chat provides the
common interface between queries + channels.

Change-Id: Ie6d110a3413e41bb42516f39e97b6cc11e8a777a
Reviewed-on: http://gerrit.dmdirc.com/3774
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: Id3cfa404a56528542120f79c969d992a5c183aba
Reviewed-on: http://gerrit.dmdirc.com/3771
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Change-Id: I2baa7e986ded54930093768238ed24cab8cf4bf7
Depends-On: I2cf35d5859c85c3609002f126241536fda5d588e
Reviewed-on: http://gerrit.dmdirc.com/3769
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Common methods from GroupChat pushed down into Chat.

Change-Id: I57a6edc40ec9628dec4d0734989917ae379eff19
Reviewed-on: http://gerrit.dmdirc.com/3423
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Instead of returning either null or a topic, use Optional<>.

Change-Id: I9e8723fe0fe2b9209a401d33361f80fb832b9434
Depends-On: If0a0609ab778df22c02b8dc1d349da45b4b5b16f
Reviewed-on: http://gerrit.dmdirc.com/3415
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I9cac49145b6b6eb124bea1a3dca87d6b0344a49d
Reviewed-on: http://gerrit.dmdirc.com/3411
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager