Feel like we've got a few too many moving parts at the moment,
so explicitly set versions of our dependencies.

Also took the opportunity to upgrade a couple of things.

Change-Id: I1af4dbfbbd149e5a4c64e83f66de015affcf4032
Reviewed-on: http://gerrit.dmdirc.com/4001
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: If96ce40a9e3afaf07858eec6ee17fc384715d240
Reviewed-on: http://gerrit.dmdirc.com/3947
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

Change-Id: Ia9bb44a6ac02aec3d5991a1d3a9a003a344b6947
Reviewed-on: http://gerrit.dmdirc.com/3919
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I19e0e2da3fe8d22b633c3f8363516d2bd77bf0a8
Reviewed-on: http://gerrit.dmdirc.com/3902
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: I927fe011c2e3675fc1e93624f8fc679a03d19077
Reviewed-on: http://gerrit.dmdirc.com/3901
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: If2da48b3dbfeabb1f7df9b07201251fc1e1ac417
Reviewed-on: http://gerrit.dmdirc.com/3897
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I74c0aa82d9a3651a88f216ea029c4ba8a7a71481
Reviewed-on: http://gerrit.dmdirc.com/3895
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: Ie5281df14a0f27067e62a7b9578c1b3c1271c46c
Reviewed-on: http://gerrit.dmdirc.com/3890
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

* 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>