better counterexample minimization.
- it separates interaction plans from their state of execution
- it removes closures from the property definitions, encoding properties as an enum variant, and deriving the closures from the variants.
- it adds some naive counterexample minimization capabilities to the Limbo simulator and reduces the plan sizes considerably.
- it makes small changes to various points of the simulator for better error reporting, enhancing code readability, small fixes to handle previously missed cases
