_AC_Pure ppfilter for Sol 2.0+ only 4.0a

New filter for people to try if they want to. This one will eventually get lumped in with my AC_Colors filter pack once I get feedback on what's wrong with it. It is very similar to the AC_Colors filter, but with two major differences, the color grading and lighting. For this filter I removed a lot of the cyan and magenta intensity out of the blue colors to try and get a better sky color. For the lighting, I reduced the exposure and increased the tone mapping gamma. It has about the same brightness overall as my AC_Colors filter. The difference is with less exposure the whites are not as over exposed and the shadow areas are not as dark with extra tonemap gamma. Personally, I really like this filter compared to my other ones.