- Note: target framework for UAT (mono project) is upped to 4.5 to match UBT.
#codereview Josh.Adams, Michael.Trepka, Kellan.Carr, Gil.Gribb
[CL 2285233 by Dmitry Rekman in Main branch]
#change UBT will check for API version of all UnrealHeaderTool binaries to detect partial syncs
#change Added BuildHostPlatform class for runtime platform abstraction
[CL 2245408 by Robert Manuszewski in Main branch]