`FredEmmott::cppwinrt`

FredEmmott::cppwinrt is a header-only support library for C++/WinRT.

This library is primarily intended for use as an implementation detail of FredEmmott::bindline and FredEmmott::weak_refs, but it also contains functions and C++20 concepts that can be useful without the other two libraries; for example, concepts are included for winrt_implementation, winrt_interface, winrt_com_ptr.