C++/WinRT can now be compiled as C++ modules.

What's Changed

C++/WinRT can now be compiled as C++ modules.

• Remove <experimental/coroutine> and add missing std qualifications by @YexuanXiao in #2
• Clean up experimental/coroutine by @YexuanXiao in #3
• Investigate the suppression of warnings by @YexuanXiao in #4
• Modularization and fixes for legacy header files and std:: prefixes by @YexuanXiao in #8
• Remove the preprocessor directives used to detect C++20 by @YexuanXiao in #9
• Implement -modules and -config options by @YexuanXiao in #10
• Added module tests for MSBuild, temporarily disabled CMake tests for … by @YexuanXiao in #11
• Rename Microsoft.Windows.CppWinRT with YexuanXiao.CppWinRTPlus by @YexuanXiao in #12

Full Changelog: v2.1.260222.0...v2.1.260224.1