fixOSXMSAA
use 4x MSAA by default on OSX closes https://www.graphics.rwth-aachen.de:9000/OpenFlipper-Free/OpenFlipper-Free/issues/130
use 4x MSAA by default on OSX closes https://www.graphics.rwth-aachen.de:9000/OpenFlipper-Free/OpenFlipper-Free/issues/130