Replace local header placeholders in appinstaller with direct references to upstream headers. Deleted the gitlink/header stubs (certmgr.h, notice.h, pkgmgr.h, pkgread.h, priformatcli.h) from appinstaller, updated main.cpp and appxinfo.h to include the ../path to those headers, and adjusted appinstaller.vcxproj.filters to point to the new locations. Cleans up redundant local links and ensures the project references the original header files.
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