Using WRL - Windows Runtime C++ Template Library

The recent changes for supporting Direct2D 1.1 added much 'lightweight COM' 
code to call Windows graphics infrastructure APIs. I tried to encapsulate 
lifetimes and class hierarchy navigation using specializations of 
std::unique_ptr and some custom templated code.

Such code is more likely to contain bugs than code that uses common Windows 
facilities and will also be less familiar to other Windows developers. The 
WRL is a Microsoft produced library that handles COM with better 
abstractions and safety than the bare COM API. I believe that using WRL 
would be worthwhile in Scintilla's Win32 platform layer.

WRL is distributed with Visual C++ and also with mingw-w64, including the 
cross-compiler on Linux. While cross-compiling works, it is possible there 
are issues with particular tool chains.

https://learn.microsoft.com/en-us/cpp/cppcx/wrl/windows-runtime-cpp-template-library-wrl?view=msvc-170

Neil

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