const-util 2.2.0

Stable implementations for some missing const functions
Documentation 
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Provides stable const implementations for some things missing from the standard library.

Currently implemented are
- Functions in [`result`](https://docs.rs/const-util/latest/const_util/result/) to unwrap [`Result`](core::result::Result)s with generics or drop glue
- Functions in the [`concat`](https://docs.rs/const-util/latest/const_util/concat/) module to concat const strings and byte slices.
- [`destruct_tuple`](https://docs.rs/const-util/latest/const_util/macro.destruct_tuple.html) to destructure tuples with generic types or types with drop glue in them
- [`nonnull_from`](https://docs.rs/const-util/latest/const_util/mem/fn.nonnull_from.html) to create [`NonNull`](core::ptr::NonNull)s from mutable and regular references
  conveniently
- [`man_drop_ref`](https://docs.rs/const-util/latest/const_util/mem/fn.man_drop_ref.html)/[`man_drop_mut`](https://docs.rs/const-util/latest/const_util/mem/fn.man_drop_mut.html) as a workaround for the lack of const
  [`Deref`](core::ops::Deref) implementations

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