RandomIG is a random image generator that takes a function as a random seed.
In order to compile it, you need this expression parsing library: http://www.bestcode.com/assets/docs/bcParserNET/solution_bcparser.net.htm
Seed: This is the expression that takes (x, y) arguments (image co-ordinates), in order to generate random seed.
PSeed: This is the expression that will be evaluated on the previous and the current seed, and it's used instead of the new seed. (x is the old seed, y is the new seed)
The following is a generated image of (x*x) + (y*y).
