Updated NuGet packaging for VS 2019#58

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Haarmees wants to merge 5 commits intoNateRickard:masterfrom

Haarmees:feature/nuget-pack-update

Commits on Nov 16, 2020

test with nuspec
Haarmees
committed

Commits on Nov 20, 2020

changed uwp package map
JochemH
committed
removed nuget.build.packaging
Haarmees
committed

Commits on Nov 22, 2020