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.
Actually, we still need to include the video library. It's not part of processing-core anymore, so you'll have to clone the processing-video project, figure out the build, and adjust the processing.py build to suit. It's a recent change to their build process. I don't know why they did it.