#branch UE4
#proj Runtime.Engine
#summary Implemented a struct customization for FRange and changed these two properties to an FRange, which can be accordingly clamped.
#add Implemented FRangeStructCustomization<> for FFloatRange and FInt32Range.
#add Implemented FFloatRange and FInt32Range mirrors in Object.h, for use by UHT.
#change Changed the Type member of TRangeBound to be an explicitly sized TEnumAsByte instead of a plain enum (so that the mirrored structs for UHT are guaranteed to match).
#change Changed Min and MaxSmoothedFrameRate members in UEngine to use a FFloatRange and added appropriate metadata.
#reviewedby Chris.Wood, Max.Preussner
[CL 2039474 by Richard TalbotWatkin in Main branch]
