Integration of ODEs with stochastic rewrites

This is required functionality for things like Stock Flow diagrams and Petri Nets with Rates to be used. It is the common language those user-friendly presentations get compiled down to. One plan for this is written [here](https://www.localcharts.org/t/coupling-odes-with-acsets/21753)

It remains to be decided how the clock gets advanced.

If one draws that the next event is very far in the future, one may wish to integrate the ODE a bit and then resample all of the clocks that got affected by changed parameters.