Revert "Adddc feature to return black or white based on which contrasts best with current colour. This is useful for setting the font colour of text that appears on top of anything that uses this colour instance."

This reverts commit 26f278b3dc97b0208e4c80a1b8cba24f38537f55.
Added feature to return black or white based on which contrasts best with current colour. This is useful for setting the font colour of text that appears on top of anything that uses this colour instance.