Blender Git Loki

fix for #3498

(Swap colors on bigendian machines)

I also made it so that the env variable is tried ahead of all
of the other looking. (That way you can override a system default
if its broken without having to upgrade)

This also makes it so we can remove the OSX ifdef. So I did.
lukep: If you still want it add it back in but my gut says the less ifdefs
we have the better ;)

Kent