Update submodules: plugins (new commits)

plugins:
    a70c6c7 Greg Holmes <greg@dmdirc.com>
            Bring popped out window to focus when switching keyboard input.

            Fixes-Issue: CLIENT-388
            Gerrit: http://gerrit.dmdirc.com/2623

    786644a Greg Holmes <greg@dmdirc.com>
            Abstract look and feel fixes from MapEntryRenderer.

            Gerrit: http://gerrit.dmdirc.com/2621

Change-Id: I8812866fe945a4b6b1bc3a0ed8aeac59a9f53baa