This is prone to race conditions if an error occurs when
the EDT is waiting on a lock owned by the erroring thread.

Fixes DMDirc/DMDirc#805

Issue #522

Apparently you can't left/right align things vertically, who knew.

Closes #761

If there's no notification, we have to fallback to the treeview's
foreground colour instead of hardcoding black...

Closes #503

(Depends on MBassador version bump in core)

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

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

These interfaces are basically pointless.

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

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.