Update submodules: plugins (new commits)

plugins:
    801bf9a Greg Holmes <greg@dmdirc.com>
            Gradle copies the res folder.  Use this.

            This copies licenses, identities, preferences, and anything else we add.

            Gerrit: http://gerrit.dmdirc.com/4024

Change-Id: Iee17a3c754196c5dc0f512c669febb7ff0ca04c4