merge changes for Snowstorm fall contributions

build.sh

doc/contributions.txt

indra/lib/python/indra/base/lluuid.py

indra/llaudio/llaudiodecodemgr.cpp

indra/llaudio/llaudioengine.cpp

indra/llmath/llvolume.cpp

indra/llui/llbutton.cpp

indra/llui/llcommandmanager.cpp

indra/llui/llcommandmanager.h

indra/llui/lltabcontainer.cpp

indra/llui/lltabcontainer.h

indra/llui/lltoolbar.cpp

indra/llwindow/llopenglview-objc.mm

indra/newview/CMakeLists.txt

indra/newview/app_settings/commands.xml

indra/newview/app_settings/settings.xml

indra/newview/llagent.cpp

indra/newview/llagent.h

indra/newview/llenvmanager.cpp

indra/newview/llenvmanager.h