Suggestion: Import useful functions from IMath

[bhouston]

Hi,

I'm from the VFX field. We generally use https://github.com/openexr/openexr/tree/master/IlmBase/Imath because well, it is awesome. BUt it isn't designed for max performance, rather just usefulness and correctness. I'd suggest porting some of the advanced functionality and classes across to this library.

Best regards, Ben Houston

[malamanteau]

Very cool idea. I might start fusing some of this functionality over the coming months into my branch. Before I can get to this I'll be adding SIMD integer vectors to my branch, so it might be a little while.