cubemap reflectance I/O algorithm cleanup. now references glosscolor directly where possible instead of jumping through contortions, and better accounts for blending with diffuse coloration. (better being defined as 'more closely matches modeling aps'). in the process, shifted the /128 porion to the sliderbar directly, ince that's for turning it into a percentail. same with /5. also found that specpower was actively *replacing* gloss, rather than working in conjunction with it, so simplified it on down to an either/or.