Improve Visual Studio detection and add VS2019 support#1762

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joaocgreis wants to merge 6 commits intonodejs:masterfrom JaneaSystems:joaocgreis-J5O-generic-vs

Commits on May 30, 2019

fixup! gyp: enable MARMASM items only on new VS versions
joaocgreis
committed

Commits on May 31, 2019

win: support running in VS Command Prompt
joaocgreis
committed