WinUI 3, C++/WinRT, and Xaml with CMake

Status

This is an as-is, unsupported, proof of concept. No help is available.

Notes

For a real-world application, see https://github.com/openkneeboard/openkneeboard

• Xaml-related header files must be listed as targert sources
• The Directory.Build.targets file is currently required; it slightly modifies the CMake generator
• I've avoided use namespace to be explicit; I'm not aiming for this to be 'best practice', just to be unambiguous and minimal
• pch.h and its' contents are required by the generated code
• pch.h is not currently a pre-compiled header