[LVL ED] Black&White screen effect possible?

[TheGreatCthulhu]

The problem is that the original shader that came with the game cannot be overriden in a FC, and that it cannot achieve things like grayscale (it can only tint things and adjust levels a bit) - this is why I wrote another one to replace it. The new one can do what the old one could, but it can also do grayscale, or a similar effect. Also, it can combine (blend) between the two. Now, it was important to be able to choose between one or the other, and the only way to do that is to encode that information into the effect image itself. Since the old image couldn't really account for that, it also had to be replaced. This is also what enables the main game to remain unchanged.