Fix culling on Low+ water reflection pass.

Make Mid+ / High use class1 deferred sky again (no rainbows, but faster!).

Fix setting of cloud color for deferred sky/cloud shaders.

Put water reflections back in wrong colorspace for consistency with release.

More tweaking ambient light.

Put back atten for non-ALM lighting that accounts for inverted lin atten setup of yore.

Modify forward projector lighting to use falloff like the deferred lights.

Make tex cache not evaluate evictions for size during validation passes.

(engages AMBIENT_KILL, SUNLIGHT_KILL, and LOCAL_LIGHT_KILL defines in shaders to accomplish
  those tasks as required by each render mode).

Fix ambient light inputs to the renderer.

Fix 3rd sky shader w/ mistaken density mod conversion.

Make ambient clamp apply to all modes.

Tune ALM ambient clamp to match non-ALM.

Consistency across class2/3/ALM lighting.

Restore light sum loops to fix broken ambient.

Add directory names to sentinels in shaders so shaders with same filename can be differentiated in nSight while debugging.

Add decls for intermediate lighting values for debug.

Rearrange ordering of scale down of light in class1 as well.

Fix name of attenuation setter used.

Fix flipped light vec.

Make class3 lights use shadows on projector ambiance too.

Fix lighting issues when using shaders, but not ALM.

Shader code cleanup (remove do nothing functions only in one file).

Fix obsolete comment to refer to correct storage for projector ambiance.

Fix class 1 and 2 transport/gamma funcs and made usage consistent across all shaders.

Fix class1\environment\waterV reverting to old d1/d2 names for wave directions.

Also fix terrain response to atmospherics shaders (was failing to apply ambient on low end even when atmospherics was on).

MAINT-6551 One of my avatars does not render correctly when ALM is disabled unless basic shaders are also disabled.

NORSPEC-290 Shader optimization WIP -- remove a couple normalizes, pows, and divides from various lighting functions.

NORSPEC-198, NORSPEC-176, NORSPEC-106, NORSPEC-202 et al -- Material matrix testing based overhaul WIP

Reviewed by Graham

NORSPEC-57, NORSPEC-58  Remove sRGB and gamma correction from shaders to remove banding and not break all shiny objects.