Iridescence final version

I've finished the final version of Iridescence, adding the long-missing setup dialog, used a standalone exe instead of an exe/bat combo, and fixing a crash on older machines (I set up a large pixel buffer for certain effects that weren't used in this demo... Seems old ati 9800 cards don't like that). The content hasn't been changed, it's not that I'm 100% happy with it but I prefer making new demos instead of revising old ones :)