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>

Change-Id: I3e4fd86a0d19f5167506df5986f7ec256b224820
Reviewed-on: http://gerrit.dmdirc.com/2979
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I1eea04000294c228a8f66464c89f92c1a7cd5321
Reviewed-on: http://gerrit.dmdirc.com/2605
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I9741fee955a4eef2449ed2f93a06b8b7b80c5504
Reviewed-on: http://gerrit.dmdirc.com/2435
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Change-Id: I559bbd9a7e6abdfc73068d4934cfb0fc9f7ce84c
Reviewed-on: http://gerrit.dmdirc.com/2289
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: Id75a4947fe4c2a08460b4ee9e6e481c568d0c6d3
Reviewed-on: http://gerrit.dmdirc.com/2074
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

Fixes issue 4035

Change-Id: I7c29ec0d55ba00295e85c94e7364ad59bf9bbaa3
Reviewed-on: http://gerrit.dmdirc.com/1220
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Gregory Holmes <greg@dmdirc.com>

Change-Id: Ie8fe55536d320ab50472d8090b63c701cc4b12ba
Reviewed-on: http://gerrit.dmdirc.com/230
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>
Tested-by: Shane Mc Cormack <shane@dmdirc.com>