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.

Define a 'plugin' function to use in place of 'project' that
will figure out where the plugin is living in the root gradle
project.

This allows the plugins to be included and built properly
when they are in a submodule of either the client or the meta
project.

Change-Id: Iacc3551ac9c0bf2343151eb9cf85296c85c5a28b
Reviewed-on: http://gerrit.dmdirc.com/4028
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I26a93d47ae740426ff56e9690302ceebad0fda53
Reviewed-on: http://gerrit.dmdirc.com/3987
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Fix assorted PMD errors.

Change-Id: I9af7e36f2aeb10bd658c5825ad2f94161e0bb243
Reviewed-on: http://gerrit.dmdirc.com/3940
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

* Move all plugins to their own top-level directories.
* Move resources out of source trees
* Add Gradle build scripts.
* Remove ivy and ant build scripts.

Change-Id: Ib69a48ef26800c174ccf51c84ff9d1f73529460f
Depends-On: I303b6b69518468f98d48d835b8f40135d9e4bcbf
Reviewed-on: http://gerrit.dmdirc.com/3850
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>