Get standalone processing.py working again

This was actually fairly simple - just chasing down a few null pointers and telling ant that there isn't a video library in p5 core anymore.

I haven't played with it extensively but tests pass.
Could something in here cause path backslashes on Windows to be interpreted as escapes? The classic which is making me chuckle right now is "{TAB}oxic{TAB}oxiclibs_p5.jar".