Correct Packing Pattern (Support C# & C++/WinRT)

[kitUIN]

• Fix .nuspec/.targets To Support C# and C++/WinRT
• Use Generic.xaml , automatic merging of xaml resource files
• Fix WinUI3 x86 __cdecl -> __stdcall

[HO-COOH]

After the changes, a newly created C++UWP project is not able to run.

[HO-COOH]

Sorry, but I am no longer able to build the UWPCsharpExample project, and got these errors

1>------ Build started: Project: UWPCSharpExample, Configuration: Debug x64 ------
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763). Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-arm. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-arm-aot. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-arm64-aot. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-x64. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-x64-aot. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-x86. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.
NU1202: Package WinUIEssential.UWP 1.2.7 is not compatible with uap10.0.17763 (UAP,Version=v10.0.17763) / win10-x86-aot. Package WinUIEssential.UWP 1.2.7 does not support any target frameworks.

I build the UWPPackage nuget first, then install to the UWPCsharpExample project.