Issue #750

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.

The way we're handling Yaml files ends up with an uncast Object
and we'll need to use these methods whenever handling Yaml.

Move PreferencesReaderUtils into utils, rename to just
YamlReaderUtils, and change the exception types it throws.

Change-Id: I5602740277185f20dab90621f73ed30204711c8b
Reviewed-on: http://gerrit.dmdirc.com/3518
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I951d38ca97e99e33146e5484512e8934e53daff5
Reviewed-on: http://gerrit.dmdirc.com/3326
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>