Pixelation Effect Added

I've added a pixelation shader to the package directly, so you no longer have to calculate your render scale in the render pipeline asset. I still prefer the render pipeline method, but I figured it would be nice to add some flexibility to the package for those who would prefer it. The attached screenshots demonstrate the effect in action at a scale of 6, using the new assets published by https://elbolilloduro.itch.io/.