Moving out of raw pointers with FnOnce

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Pre-RFC: Move references

Edit: Rev. 2 Edit: Rev. 3 ... Edit: Rev. 6 Thank you all. Original proposal Feature Name: Move references Start Date: 2021-04-17 RFC PR: rust-lang/rfcs#0000 Rust Issue: rust-lang/rust#0000 Summary Move reference is a new kind of references that are intended to allow moving the value, but not the memory it's stored in and ease the story of initialization, essentially allowing more cases of its deferred and partial variants. Motivation Make Box less special by creating mechanism (…