Enable PMD in gradle + apply fixes.
Change-Id: I3665cac8af833da793ca418953d934cc3a333459
Depends-On: I348b37a14097439f8a56b0a671794410e46201ca
Depends-On: Ifc4aa601de14ca2526646f499f60329ed7c5935e
Reviewed-on: http://gerrit.dmdirc.com/3939
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
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