feature/format: Merge toolset update#1578

Merged

StephanTLavavej merged 10 commits intofeature/formatfrom

Jan 22, 2021

Commits on Jan 16, 2021

P0408R7 Efficient Access To basic_stringbuf's Buffer (#919)

Berrysoft
and
StephanTLavavej
authored

Commits on Jan 20, 2021

Avoid conflict with ICU macroizing _No (#1570)
StephanTLavavej
authored

Commits on Jan 22, 2021

Specify the requirements for promise/future/shared_future per LWG-3466 (#1572)
Michael S. Rizkalla
authored
Toolset update: VS 2019 16.9 Preview 3 (#1577)
StephanTLavavej
authored