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Move alloc::prelude::* to alloc::prelude::v1, make alloc a subset of std
This was one of the unresolved questions of rust-lang/rfcs#2480.
As the RFC says this is maybe not useful in the sense that we are unlikely
to ever have a second version, but making the crate a true subset
makes one less issue to think about if we stabilize it and later
want to merge standard library crates and have Cargo feature flags
to enable or disable parts of the `std` crate.
See also discussion in rust-lang#58175
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