Update for VS 2019#91

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cogwheel wants to merge 5 commits intocaffeinetv:masterfrom

cogwheel:vs2019

Commits on Aug 12, 2019

Update for VS 2019
Matthew Orlando
committed

Commits on Aug 13, 2019

Attempt appveyor fix
Matthew Orlando
committed
Attempt built-in clang-cl support
Matthew Orlando
committed

Commits on Aug 14, 2019

Second attempt at fix
Matthew Orlando
committed
Test another random thing
Matthew Orlando
committed