- Changed Core module to use Core.h (removed CorePrivate.h)
- CorePrivate.h only included Core.h, so their PCHs were identical other than name
- Does not affect modular builds, as we need different defines for DLLExport/DLLImport for private and public PCH headers
[CL 2221011 by Mike Fricker in Main branch]
#proj UE4
#branch UE4
#summary Verified why @ was disallowed
#extra Also improved the robustness of the path validator and disallowed some extra things that had previously been missed.
#extra Made the way we report invalid characters consistent between FPaths, FName, and FPackageName; they now report all matched invalid characters rather than only the first one.
#reviewedby Thomas.Sarkanen, Max.Preussner
[CL 2043081 by Jamie Dale in Main branch]
