Plaformer Game Tutorial

I was suprised by the interest in the code I wrote for learning the platformer game. It wasn’t the best Lisp code. I just uploaded what I had.

But enough people were interested that I decided to give it a once over. At https://github.com/jrm-code-project/PlatformerTutorial I have a rewrite where each chapter of the tutorial has been broken off into a separate git branch. The code is much cleaner and several kludges and idioticies were removed (and I hope none added).