markNestedProofs
grind
This PR fixes the `markNestedProofs` preprocessor used in `grind`. There was a missing case (e.g., `Expr.mdata`)
This PR reviews the implicitness of arguments across List/Array/Vector, generally trying to make arguments implicit where possible, although sometimes correcting propositional arguments which were incorrectly implicit to explicit.
This PR fixes a bug in the `markNestedProofs` preprocessor used in the `grind` tactic.