* Less Lengthy enum/macro names. * Optimize computation of Spherical Harmonics. * Reduce radiance cubemap size a bit. Higher resolution is not necessary. * Remove STUDIOLIGHT_LIGHT_DIRECTION_CALCULATED (was not used). * Do windowing on each component separately instead of using luminance. * Use ITER_PIXELS to iterate on each pixels, using pixel center coords. * Remove gpu_matcap_3components as it is only needed when creating the gputex. * Fix a lot of confusion in axis denomination/swizzle. These changes should not affect functionallity.