Another Particle Update

Thanks in no small part to the capable brain of Noel Llopis, I've gotten past what I think is the last great barrier to getting the particle system tutorial done. As you can see, sprites are now working, which opens up a whole world of new effects.



There is still a lot of cleanup to do, and I need to continue with some of the planned performance enhancements and probably look for some new ones, but at least, thanks to some help from smart readers, the particle system has stopped being an albatross around my neck.

Look for a final release and tutorial by the end of next weekend.