Hide a bunch of debug logging statements in #ifdef SHOW_DEBUG to prevent spinning a mutex in hot paths.

Revert "SL-13768 Remove glow from moon when sun is down due to it using the sun glow setting (pull request #297)"

Fix class2/windlight clouds.

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.

Nerf moisture and ice levels iff there's no sun or moon to generate light to refract.

Fix direct light matching across alpha/blended-material/deferred.

Get diffuse lighting to match from Low to Ultra.

Make sun disc and moon shaders use sRGB hardware tex sampling.

Remove sun disc shader use of fullbright transport (fogging).

Make moon disc image render only if current or previous textures are available.

Will wait for a response from @graham_linden regarding moving the sRGB conversion functions in llmath.h to llrender.

Make sure lights are in the correct color space.
Bonus: cache the sRGB color in setLightColor on point and spot lights.  Frees up a pow and some multiplies on the CPU every frame.

Mods to make merge with viewer-release have less whitespace-only change and fix diffs between EEP and VR.

Fix distortion map rendering in deferred mode not including underwater fog effects.

Fix distortion map rendering not including post-deferred content at all.

Fix distortion map rendering not including anything but sky when camera is underwater.

Update sun_up_factor/sunmoon_glow_factor uniforms even when sun disc isn't in use.

Fix side-effects of having both sun and moon as potential directional light contributors.
We pass an int to the shader indicating which to prefer instead of making per-pixel decisions
and pass the moonlight color/di independently.

Obsolete llsettingssky fade color which was unused elsewhere and cached for no reason.

Fix bug with setting texture matrix for rigged mesh.

Fix z-fighting between sea and sky in ALM by cheating sky, stars, and moon using gl_FragDepth.

Fix handling of atmospheric haze glow w.r.t independent sun/moon positioning
(we can no longer depend on them being mutex to each other).

SL-9851

Fix cloud shaders to ignore clouds when cloud_scale is 0.

Fix creation of heavenly body geo to avoid degenerate vector math
and not randomly flip orientation when crossing zenith.

Add sun_up_factor to eliminate sun glow around moon when sun is down.

Add new class3 shadow shaders for VSM shadows.

Add disabled shadow pass in WLSky for using above.

the reflections will better match what they're reflecting
when ALM is enabled.

SL-9806 stop rendering stars post deferred so they can be depth sorted properly with clouds and heavenly bodies.

SL-9976 change moon blend/brightness handling in shaders and cleanup extraneous GL state management.

Port over transport, gamma, atmospherics shader stub updates for per-fragment atmospherics.

Fix bindings of current/next noise map when current and next are the same (select only one and force blend factor to 0).