Build fixes for Linux, UWP and CMake#157

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jakrams wants to merge 4 commits intolsalzman:masterfrom

jakrams:user/jakras/build-fixes

Commits on Mar 16, 2021

Fixed potential uninitialized variable access
Jan Krassnigg
committed
Fixed #90 to unblock Linux builds
Jan Krassnigg
committed
Fixed an issue building on UWP
Jan Krassnigg
committed
Raised minimum CMake version to fix warning
Jan Krassnigg
committed