Deadtime Behavior

From a slack thread with Matt on Jan. 31, 2024:

Matt, does the 0x80 in this line in control.py mean that SlowUpdate will not be sent if any readout group has deadtime?

            # Force SlowUpdate to respect deadtime                                     
            if not self.pva.pv_put(pv, (0x80 | ControlDef.transitionId['SlowUpdate'])):

Matt writes: The coupled deadtime idea didn't work.  So, this should make the transition respect deadtime per readout group (some might get it and some might not).

Brainstorming

Issue: SlowUpdate currently preempts L1Accept, so integrating detectors miss their normalization data

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