Automatically promote input variables in BTOR2 constraints #261
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The BTOR2 input format allows constraints containing input variables. This requires promoting those input variables to state variables within Pono's infrastructure (which does not allow input variables in any invariant constraints, the initial states, or the property). The reason for this is that inputs are supposed to only be affiliated with a transition, so it doesn't make sense to have an invariant constraint over them which refers to sets of states. However, this might be worth revisiting.