Proposal: Add @deprecatedReturn Annotation

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Proposal: Add @deprecatedAccessibility Annotation

Proposal Add a @deprecatedAccessibility (or @deprecatedVisibility) constant annotation allowing you to specify a new access modifier narrower than the current one, and deprecating access outside of that scope. For example: @deprecatedAccessibility("private[mutable]") class ArrayBufferView[A] { ... } In the example, ArrayBufferView would be accessible within scala.collection.mutable, but would be considered deprecated outside of that package. Motivation Sometimes, classes or methods in the st…