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).

Fix positioning of sun/moon discs w.r.t atmo haze glow.

Disable killing glow when sun is not up.

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.

EXP-2592 FIX -- (OS X Lion) Graphics issues with Atmospheric Shaders enabled on Intel HD 3000, 10.7.2

* Fixed up shaders to add haze_density and blue_density together correctly as vec4's rather than
  relying on the shader compiler to add them together properly.

SH-2592 PROGRESS -- (OS X Lion) Graphics issues with Atmospheric Shaders enabled on Intel HD 3000, 10.7.2

Refactored WindLight estate settings to use float uniforms in the shaders that
only need it, rather than vec4's for everything.

SH-1682 Dynamically adjust the number of texture channels to use for indexed texture rendering based on available hardware.

See https://wiki.lindenlab.com/wiki/License_Substitution for details.

windlight14 which have passed QA (up through r79932).

svn merge -r 80831:80833 svn+ssh://svn.lindenlab.com/svn/linden/branches/merge_windlight14_r80620