core: Switch to unconditional no_std #3323
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… and update imports accordingly.
Motivation
Makes the code less weird, and makes
std
dependencies clearer by not using the prelude anymore.Solution
See individual commits.
@hds if you like this, I can convert the remaining crates that currently have
#![cfg_attr(not(feature = "std"), no_std)]
to this style in follow-up PRs.