Add a DMDirc icon instead of java icon for editor window. Stop doubling duration preferences. Change-Id: Ide11244753c3fa86cb5914e1089929d385dc5545 Fixes-Issue: CLIENT-458 Fixes-Issue: CLIENT-459 Reviewed-on: http://gerrit.dmdirc.com/3207 Reviewed-by: Chris Smith <chris@dmdirc.com> Automatic-Compile: DMDirc Build Manager