Add new shaders for advanced atmo SH env lighting calcs.

indra/llinventory/llsettingssky.cpp

indra/newview/app_settings/settings.xml

indra/newview/app_settings/shaders/class1/deferred/cofF.glsl

...ew/app_settings/shaders/class3/deferred/deferredUtil.glsl

...ettings/shaders/class3/deferred/depthToShadowVolumeG.glsl

...ew/app_settings/shaders/class3/deferred/gatherSkyShF.glsl

...ew/app_settings/shaders/class3/deferred/gatherSkyShV.glsl

...wview/app_settings/shaders/class3/deferred/genSkyShF.glsl

...wview/app_settings/shaders/class3/deferred/genSkyShV.glsl

...ewview/app_settings/shaders/class3/deferred/indirect.glsl

...wview/app_settings/shaders/class3/deferred/lightUtil.glsl

...pp_settings/shaders/class3/deferred/pointShadowBlurF.glsl

.../newview/app_settings/shaders/class3/deferred/shVisF.glsl

.../newview/app_settings/shaders/class3/deferred/shVisV.glsl

...p_settings/shaders/class3/deferred/shadowAlphaBlendF.glsl

...p_settings/shaders/class3/deferred/shadowAlphaBlendV.glsl

...pp_settings/shaders/class3/deferred/shadowAlphaMaskF.glsl

...pp_settings/shaders/class3/deferred/shadowAlphaMaskV.glsl

...iew/app_settings/shaders/class3/deferred/shadowCubeV.glsl

...newview/app_settings/shaders/class3/deferred/shadowF.glsl