Replace clamp on height in atmospherics calcs on fragment shader path.

Fix colorspace conversions in material shaders in forward rendering mode.

Fix deferred shaders not setting the sun_up_factor uniform and getting moonlight instead of sunlight.

Make area beyond far split of directional light unshadowed again.

Remove assert and replace with warning when rigged mesh tries to use tex anim on tex index > 1.

Another pass at playing with shadow_offset/bias to balance between peter-panning and shadow acne while sun and/or moon are near the horizon.

Make moon texture from default daycycle the default moon texture id and use it for the default and blank assets in the picker.

Fix handling of MM_TEXTURE to correctly detect when texture units outside the range 0-3
are used with texture matrix ops to prevent mem overwrite bug and/or asserts.

Use brighter moon texture for both default and blank moon texture ids in picker.

(which was not true as the assert on same fired).

SL-10456 FIXED [EEP] Viewer continues to show last EEP environment after teleporting from EEP to non-EEP region

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.

SL-10461

Another attempt at getting approximage handling of projector ambiance in the alpha object shader.
This will not be a perfect match for non-transparent objects but should be close enough.

SL-10279 Use stored environment instead of region one

Approved-by: Maxim Nikolenko <maximnproductengine@lindenlab.com>

Make fix which gets 10276 and 10443, but leaves the bizarre flip at the zenith
so that the sun/moon textures are always upright w.r.t the viewer.

Fix panel_settings_water increments for Underwater Modifier and wave directions.

SL-10459, SL-10461

Pass projector ambiance as the .w element of the light_attenuation uniform
so that alpha shader can emulate the behavior of proper spot projectors.

Use gl_FragDepth on deferred sun disc to fix z-fighting with sky dome and get layering of sky/stars/sun/moon/clouds correct.

SL-9996, SL-1130, SL-5546

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).

Fix for OSX shader compiler knock-on

SL-1531 Hover highlight should be consistent with mouse selection

SL-10364 FIXED Parcel Sky Altitudes not set correct when opening About Land -> Environment for the first time upon region arrival