Fix for bad fullbright shiny shininess values and inconsistency between materialF and fullbrightShinyF

Fix for mismatch on angular attenuation between sunlight on opaque and transparent objects from last commit.

Fix for sunlight having improper gamma curve for angular attenuation.  Fix for lack of angular attenuation on ambient lighting on triangles facing away from sun.

Fix for under water being much brighter and mismatching between alpha and deferred.  Don't make terrain fullbright under water.

WIP - Windlight sun lighting should happen in sRGB space, not linear space.  This keeps ambient from getting overblown and better matches environment lighting with ALM on/off.

WIP - fix various inconsistencies in sRGB vs linear color space.  Fix inconsistencies between softenLightF.glsl, materialF.glsl, and alphaF.glsl

This reverts commits 9d9b8901 and 5f846e42.

Adds the 'additive' component of calcAtmosphericVars into the sunlit color to reduce
darkening of sun lighting component, and adds a further magic number gainto boost
final result to rough parity with windlight.

Removes all light calculations on fullbright objects, just passing through the unlit
diffuse color.