Merge tag '6.6.5-release' of https://github.com/secondlife/viewer into heimdall

doc/contributions.txt

indra/llappearance/llavatarappearance.cpp

indra/llappearance/llpolymesh.cpp

indra/llappearance/llpolymorph.cpp

indra/llaudio/llaudiodecodemgr.cpp

indra/llaudio/llaudiodecodemgr.h

indra/llaudio/llaudioengine.cpp

indra/llaudio/llaudioengine.h

indra/llaudio/llaudioengine_fmodstudio.cpp

indra/llaudio/llaudioengine_fmodstudio.h

indra/llaudio/llaudioengine_openal.cpp

indra/llaudio/llaudioengine_openal.h

indra/llcharacter/llkeyframemotion.cpp

indra/llcharacter/llkeyframemotion.h

indra/llcommon/CMakeLists.txt

indra/llcommon/llmemory.cpp

indra/llcommon/llrefcount.cpp

indra/llcommon/llsys.cpp

indra/llcommon/llsys_objc.h

indra/llcommon/llsys_objc.mm