Merge with lindenlab/viewer-development-materials

indra/llprimitive/llmaterial.cpp

indra/llprimitive/llmaterial.h

.../newview/app_settings/shaders/class1/deferred/alphaF.glsl

.../newview/app_settings/shaders/class2/deferred/alphaF.glsl

indra/newview/lldrawpoolalpha.cpp

indra/newview/llface.cpp

indra/newview/llfloaterpreference.cpp

indra/newview/llpanelface.cpp

indra/newview/llspatialpartition.cpp

indra/newview/llspatialpartition.h

indra/newview/llviewerobject.cpp

indra/newview/llviewershadermgr.cpp

indra/newview/llvovolume.cpp

indra/newview/pipeline.cpp

...view/skins/default/xui/en/panel_preferences_graphics1.xml