TrustCell fixes#223

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zesterer merged 4 commits intoamethyst:masterfrom

Imberflur:trustcell-fix

Feb 6, 2023

Commits on Feb 4, 2023

Commits on Feb 5, 2023

Also require `T: Send` on `Sync` impl of `TrustCell` since it provides
Imberflur
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Replace use of references in `Ref` and `RefMut` with `NonNull` to
Imberflur
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