Updated files...see notes-------------------------------------------> Reorganized some examples in examples.lisp. Fixed some GC issues on some of the examples in examples.lisp as well as errors in the documentation.  Added the functions START-WINDOW-THREAD, TRACE, WARP-AFFINE, GET-ROTATION-MATRIX-2D, and GET-AFFINE-TRANSFORM.  I added examples and documentation for each of the aforementioned functions. Updated the ? macro to work with c-pointer class members.