RFC: Add a standard trait for getting many &mut to places#3100

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Nokel81 wants to merge 3 commits intorust-lang:masterfrom

Nokel81:get-mut-refs

Commits on Mar 11, 2021

initial version
Nokel81
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Commits on Mar 15, 2021

add comments about future possibilities, removed range references
Nokel81
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Commits on Apr 4, 2021

Change to a default impl, switch name, fix spelling mistakes
Nokel81
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