Document/fix reinitialization of Heavisides after pre-equilibration and pre-simulation #2918
Description
Currently, event trigger state is reinitialized after pre-equilibration and pre-simulation.
Applying the initialValue of an SBML trigger is part of model initialization, and therefore, I think, it would be more plausible to do that only once, and continue with the Heaviside state from the previous period.
Either way, the behavior should be documented.
Related to PEtab-dev/PEtab#642