merge changes for 3.5.0-beta2

.hgtags

BuildParams

doc/contributions.txt

indra/llaudio/llaudioengine.cpp

indra/llaudio/llaudioengine.h

indra/llcharacter/llanimationstates.cpp

indra/llcharacter/llanimationstates.h

indra/llcommon/llassettype.cpp

indra/llcommon/llassettype.h

indra/llcommon/llavatarname.cpp

indra/llcommon/llavatarname.h

indra/llcommon/llfoldertype.h

indra/llcommon/llhandle.h

indra/llcommon/llinitparam.cpp

indra/llcommon/llinitparam.h

indra/llcommon/llinstancetracker.h

indra/llcommon/llrefcount.h

indra/llcommon/llregistry.h

indra/llcommon/llsdparam.cpp

indra/llcommon/llthread.h