Add ArmDesktopSdk.props and a Directory.Build.props to force-import ARM desktop SDK settings (WindowsSDKDesktopARMSupport and centralized handling of the ARM desktop preprocessor define). Remove x64-specific configurations, property sheets and duplicated ARM preprocessor definitions from multiple .vcxproj files to simplify supported platforms. Update pkgread to use package-based pugixml library paths and set TreatWChar_tAsBuiltInType, and tweak solution configuration entries in AppInstallerReset.sln.
Add a new pugixml static library project and include it in the solution to support ARM builds. pkgread now references the new pugixml project (removed direct pugixml file/includes) and its Release|ARM PrecompiledHeader is set to NotUsing. Update solution configurations to include pugixml and add appropriate build platform mappings. Update notes/symlinks.md with instructions for the new project and manual copying of generated pugixml.lib; also clear an AdditionalLibraryDirectories entry in priformatcli.
