Defines the minimum allowed interval time for triggers.
Notes
When a trigger is run, it's tasks will be processed across several game ticks if necessary to avoid game lag.
In extreme cases, it's possible for several new runs of the trigger to start before a previous run has finished.
When more than PULSE_MAX_QUEUED_RUNS are queued, Pulse will start generating warning messages, as beyond this point the queue is likely to grow in size until the entire universe explodes.
For this reason, PULSE_INTERVAL_MIN ensures that trigger intervals are at least 500ms (at time of writing) to reduce the chances of PULSE_MAX_QUEUED_RUNS being reached.