Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-04-18 22:03 f6132e4d

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feat(data/nat/parity): update to match int/parity (#7156) A couple of lemmas existed for int but not for nat, so I add them. I also tidy some lemmas I added in prior PRs and add a file-level docstring.

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