Update submodules: plugins (new commits)

plugins:
    7b4a4a4 Greg Holmes <greg@dmdirc.com>
            Add VetoableListSelectionModel.

            Using this, don't allow the user to deselect things in the alias
            manager dialog.

            Gerrit: http://gerrit.dmdirc.com/3542

Change-Id: Ia88a9219fbc50b10fd33d4ce44627d7f3b64f30b
Update submodules: plugins (new commits)

plugins:
    b4d934f Greg Holmes <greg@dmdirc.com>
            If deleting selected alias, nullify selected alias.

            Gerrit: http://gerrit.dmdirc.com/3543

Change-Id: I129ade5cc2d488fe595112acebc71863d3ea029c