Update submodules: plugins (new commits)

plugins:
    e5c04b4 Chris Smith <chris@dmdirc.com>
            Start injecting TextPane dependencies.

            Bundle them up in a static class to avoid having to pass a million deps
            around in each and every subclass.

            Gerrit: http://gerrit.dmdirc.com/3064

Change-Id: I8b594c05378ca5ec5392d0d49ac80bc04c323d97