Revert "Re-implement PixMap writer in Elpi" · coq-community/corn@f3d23e0

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Coq.Unicode.Utf8 has been replaced by Stdlib.Unicode.Utf8.

Coq.Classes.SetoidTactics has been replaced by

Coq.Setoids.Setoid has been replaced by Stdlib.Setoids.Setoid.

Coq.Lists.List has been replaced by Stdlib.Lists.List.

Coq.Setoids.Setoid has been replaced by Stdlib.Setoids.Setoid.

Notation "_ = _" was already used in scope type_scope.

Notation "_ ≠ _" was already used in scope type_scope.

Declaring a scope implicitly is deprecated; use in advance an

Coq.Setoids.Setoid has been replaced by Stdlib.Setoids.Setoid.

Coq.PArith.BinPos has been replaced by Stdlib.PArith.BinPos.

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