Add common properties to XSD (#6500)
Add common properties to XSD (#6500)

Adding these allows them to be provided in Visual Studio's completion.

ProduceReferenceAssemblies
UseWindowsForms
UseWPF
AndyGerlicher/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild