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.

This handles applying a function to each item to convert it to
the desired type, removing a tiny bit of duplication.

Fix hand written YAML being rubbish.
Fix bad reading caused by bad YAML.
Generify asList casting.

Change-Id: I362e53fc9f05497f48dac4951991b79daebfdb81
Depends-On: Ide5afea6d4e7ba04cf3226f10e1ea530e1a60c10
Depends-On: Ic2a1b97aa44e9168bae4a1e28941208e7711bb46
Reviewed-on: http://gerrit.dmdirc.com/3743
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Disable some new 'controversial' PMD rules, and enable some of the
others we had suppressed.

Change-Id: Ia15d78858617e8b4dcc71c47b91d9975118206a9
Reviewed-on: http://gerrit.dmdirc.com/3642
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

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>