Added describe-pixel-format. This prints out the pixel format for any type or
object (if it has one) along with the gl keywords that would have to be passed
to opengl in order to transfer pixels.
Made pixel-format-of more consistant by not assuming :int or :uints are integral (un-normalised)
This can add a wee bit of confusion at first "Why can't I upload ints" but results in better
understanding and less having to remember things. Every edge case is a mental burden
* tweaked 11.lisp - now 45 lines of very acceptable lisp
* added v!short v!ushort
* added cls