Implement ranges::ssize#1076

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StephanTLavavej merged 5 commits intomicrosoft:masterfrom

CaseyCarter:ssize

Aug 1, 2020

Commits on Jul 22, 2020

Commits on Jul 23, 2020

Bool is not integer-like per as-yet-unnumbered LWG issue
CaseyCarter
committed

Commits on Jul 24, 2020

More STL review comments
CaseyCarter
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Commits on Jul 26, 2020

LWG-3467 now has a number.
CaseyCarter
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