Change to ConfigProvider in a few places.

Change-Id: I7c3f01392083df4150e80a836c8cb94482b4e9dc
Reviewed-on: http://gerrit.dmdirc.com/2765
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    2a45dc7 Chris Smith <chris@dmdirc.com>
            Switch to ConfigProvider in a few places.

            Depends-On: I7c3f01392083df4150e80a836c8cb94482b4e9dc
            Gerrit: http://gerrit.dmdirc.com/2766

Change-Id: If6821887bcc187f229665c94c72646a8b49f521e