#proj core
#branch UE4
#summary Rename Trunc, Round, Floor, Ceil to TruncToInt, RoundToInt, FloorToInt, CeilToInt. Added *ToFloat versions. Repeated for FGenericPlatformMath and all derived classes for all platforms wherever applicable. Corrected comment in Fractional and added Frac() which does HLSL-style fractional (x - floor(x)). Checked for compilation on all projects (with cooking levels wherever applicable). Didn't change Fractional to Frac, this will be done in second commit.
#codereview robert.manuszewski
[CL 2064306 by Mikolaj Sieluzycki in Main branch]
#proj Engine
#branch UE4
#summary Added GetFormatCapabilities to ITextureFormat interface, TextureCompressorModule attempts to downsample images that are too large.
#add GetFormatCapabilities to ITextureFormat and all affected subclasses.
#change BuildTextureMips now attempts to construct a source that is compatible with the maximum size for a texture compressor.
[CL 2053233 by Allan Bentham in Main branch]
