Lots of little fixes, plus chapter 9 example.

No, the other class is specifcially for a chapter, while this one is dealing with potential improvements to the quality on the distortion edges, as per this thread:  https://developer.oculusvr.com/forums/viewtopic.php?f=34&t=10070

What I *should* do is ensure that the shader used for this example is distinct from the basic client side distortion shader.