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Follow up to #602
Description
This PR adds back UWP support (or more precisely, support for apps using Windows.UI.Xaml projections, be it from a UWP app, or via XAML Islands, or something else). All common code with the WinUI libraries has been moved back into shared projects to the WinUI 3 projects. Along with this, the new projects also added defines for
WINDOWS_UWP
to enable conditional checks in those shared files. No changes have been done to test projects or sample apps in this PR.