C++ 20 modules demo test with qt6

environments

• Visual Studio 2022
• Qt 6.9
• CMake
• Verdigris

features

• C++ modules as dynamic library
• export legacy Qt MOC widget class as c++ modules (page_first.cppm)
• use qt without moc by Verdigris (page_second.ixx)

TODO

• fix Qt Designer promoted class import
• linux/mac support
• gcc/clang support