Remove ConfigManager references.

Change-Id: I065a771ff81e565b37689f9d6ea82d4057cec2f1
Reviewed-on: http://gerrit.dmdirc.com/2779
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    9b25853 Chris Smith <chris@dmdirc.com>
            Remove ConfigManager references.

            Gerrit: http://gerrit.dmdirc.com/2780

Change-Id: I62bd23241927125dfef459ae598d3acc420b2a48