Improve C# wrapper management of strings to ensure proper UTF-8 conversion while passing from and to C library. Regenerate CsUwpWrapper so that it can target a higher UWP API level. Enable 64 bit for win32 builds.
Modified name of jobs running one one arch. This is simplified in CI to emphasize on the Arch and not the app type (as in reality "win32" apps can be built in 64 bits...) In CI : win32 = 32bits win64 = 64bits win3264 = multiarch 32/64 bits
Now run vs2022-ninja-win64-windows both in mr and nightly, to be able to run tests Re-enabled Nightly Xamarin