Need a convenient way to synchronously delete instance of multiple classes

[modelint]

When we delete an instance synchronously, we may need to delete a whole chain of instances across multiple
relationships to preserve the model integrity. For example, in the state_machine lifecycle we would like to delete a dispatched event and all of its related instances all in one go:

state Ignore
activity
    // Delete dispatched event
    {
        disp_ev .= /R1812/Dispatched Event
        sd_ev .= disp_ev/Self Directed Event
        nsd_ev .= disp_ev/Non Self Directed Event
        active_ev .= /R1812/Active Event
        pvals ..= disp_ev/R1813/Supplied Parameter Values
        !* disp_ev, sd_ev, nsd_ev, active_ev, pvals
    } <deleted>
    <deleted> Event ignored > me