EPropertyReferenceFlags removed too, because it is unused.
#ttp 329394: UHT: Support the C++ "enum class" syntax for UENUMs
#codereview robert.manuszewski
[CL 2252907 by Steve Robb in Main branch]
#ttp 331467: Make UHT not depend on CoreUObject
#change GScriptHelper made an object instead of a heap-allocated pointer.
#change NameLookupCPP made an object instead of a heap-allocated pointer.
#add FClasses::FindAnyClass added.
#change FClasses construction moved earlier.
#change FClass::GetInnerClass added.
#change More UClasses changed to FClasses.
#codereview robert.manuszewski
[CL 2091696 by Steve Robb in Main branch]