TextToStuffColorMismatchTest - Test if text is drawn
in the color it was requested to be drawn.
This demonstrates a bug in the OSX CoreText renderer,
as used in released PTB versions since at least
30th December 2013.
16-Jun-2015 mk Derived from code provided by user shandelman116.
14-Jul-2015 mk Adapt to new situation that renderer 0 == CoreText on OSX.