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This is partial work to make `s ∩ .` be consistently used for passing to a subset of `s`. This is sort of an adjoint to `(Subtype.val : s -> _) '' .`, except for the fact that it does not produce a `Set s`. The main API changes are to `Subtype.image_preimage_val` and `Subtype.preimage_val_eq_preimage_val_iff` in `Mathlib.Data.Set.Image`. Changes in other modules are all proof fixups. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Passing.20to.20subsets.20of.20a.20subspace/near/420917406)
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