Update submodules: plugins (new commits)

plugins:
    9cbb925 Greg Holmes <greg@dmdirc.com>
            DI Calc plugin.

            Gerrit: http://gerrit.dmdirc.com/3105

Change-Id: I4843a7c98d761d0cb7586905493db3b6fc95461f
Revert FrameContainer UrlBuilder sillyness.

Makes more sense to just bite the bullet and have FrameContainers
require a URLBuilder so they can make an IconManager, rather than
have every caller pass one in.

Also removes the silly map which would've only ever had one entry,
and stops us making 19 million icon managers for giggles.

Change-Id: I3b95185db3f7e6ef09a6c4f91cd28c88d2c601ba
Depends-On: Ida8887d4065db2f26080986a4c426c6de700d65c
Reviewed-on: http://gerrit.dmdirc.com/3107
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager