add enumutils.items for sparse enums, typetraits.SomeSparseEnum (#17080)

* add enumutils.items for enum with holes
* changelog
* ref in lib.rst
* use `type SomeSparseEnum* = (not Ordinal) and enum` instead of concept
* address comment: rename back to enum with holes
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Timothee Cour 2021-02-23 11:25:35 -08:00 • committed by GitHub
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@ -85,6 +85,9 @@ Algorithms
* `algorithm <algorithm.html>`_
This module implements some common generic algorithms like sort or binary search.
* `std/enumutils <enumutils.html>`_
This module adds functionality for the built-in ``enum`` type.
* `sequtils <sequtils.html>`_
This module implements operations for the built-in ``seq`` type
which were inspired by functional programming languages.