Changed test settings.
Added a binary blend for adding a poster effect to a mask, PosterMaskBBlend.
Added a two color texture implementation of the worley noise.
Added a subtractive blend for 3d textures.
Added a poster effect mask for 3d textures.
Added never new add/subtract methods to Color.
Fixed a small typing issue with the seed value of WorleyNoise3D.
Added a new selection function for use with worley noise functions, SelectDifferenceNthMthNearest2D.