Issue #76

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.

Closes #669.

Allow colours in formats to be hex. Closes #631.

Fix ordering of highlighted messages. #669.

Instead of wrapping the source event and modifying it, they are
now proper events that are displayed themselves (and the original
message is suppressed).

This allows highlights to be formatted differently.

Issue #669

In preparation for child eventbusses being removed, anything
trying to subscribe to specific windows now needs an explicit
check.

Issue #662

Alternative highlights were never added because the maps were
optimised away; then the list occasionally ended up with null
entries as they were added concurrently.

We no longer need to be consistent with the odd casing/naming
of actions.

When a highlight is found, fire a {Channel,Query}HighlightEvent
pointing to the original event that caused the highlight.

For now this just highlights the current nickname, but it can cope
with a list of other patterns once we decide how to store and model
them.

Also for now, sets the BG colour to red. Need to make that
configurable.

Issue #36