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.

Change-Id: I06a0f4ced5eb0c8281e52a38b37a27779c5d571b
Reviewed-on: http://gerrit.dmdirc.com/3273
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: Id0904867640e49e12fca5c1c7c5b9e72c78e3a1b
Reviewed-on: http://gerrit.dmdirc.com/2976
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Introduces a ConfigProviderMigrator interface, which allows
migration of a ConfigProvider. This allows the owner of
the provider to migrate it, and pass around an instance,
while prevent any other user accidentally migrating it.

e.g. Server can own a ConfigProviderMigrator, and only
expose the inner ConfigProvider, so noone else can migrate
it to a different target.

Change-Id: I2a78947f60ba42c6877433c897ef458cead6a3e3
Fixes-Issue: CLIENT-408
Reviewed-on: http://gerrit.dmdirc.com/2828
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>