Make use of C++/WinRT when building for C++17 #368
Description
Currently I make use of WRL to directly interface with the "ABI" namespace versions of Windows Runtime APIs for audio device enumeration, GamePad, Keyboard, and Mouse implementations for UWP. I should make the code use C++/WinRT projections instead when building for /std:c++17 /Zc:__cplusplus.