feature/chrono: Merge toolset update#1716

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StephanTLavavej merged 21 commits intofeature/chronofrom

Mar 4, 2021

Commits on Feb 24, 2021

Test deduction guides with header units internally (#1567)
StephanTLavavej
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Commits on Feb 25, 2021

Commits on Feb 26, 2021

Commits on Feb 27, 2021

P0980R1 constexpr std::string (#1502)

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Commits on Mar 4, 2021

Toolset update: VS 2019 16.10 Preview 1 (#1711)
StephanTLavavej
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Fix ranges::uninitialized_copy/uninitialized_move for trivial types (#1713)
miscco
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