[Issue 13972] Make scoped, Unique, and RefCounted @nogc

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13972
Issue 13972 depends on issue 14171, which changed state.

Issue 14171 Summary: Mark non-allocating GC functions as @nogc
https://issues.dlang.org/show_bug.cgi?id=14171

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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