Remove unused UIController methods.

Change-Id: I86a87f0b42ef36760d6188fd191de1dd8fdb92f3
Depends-On: I9843993403107bebb9f7506cf8adbb3410a2d780
Reviewed-on: http://gerrit.dmdirc.com/2906
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: plugins (new commits)

plugins:
    e216057 Chris Smith <chris@dmdirc.com>
            Remove unused UIController methods.

            Depends-On: I86a87f0b42ef36760d6188fd191de1dd8fdb92f3
            Gerrit: http://gerrit.dmdirc.com/2905

Change-Id: I1c997f425860d4fcd60a31544a4ad6d003ce3453