Merge branch 'DRTVWR-500' into DRTVWR-501-maint

doc/contributions.txt

indra/cmake/Atmosphere.cmake

indra/llappearance/llavatarappearance.cpp

indra/llappearance/llavatarjoint.cpp

indra/llappearance/llavatarjointmesh.cpp

indra/llappearance/lldriverparam.cpp

indra/llappearance/llpolymorph.cpp

indra/llappearance/llpolyskeletaldistortion.cpp

indra/llappearance/lltexlayer.cpp

indra/llappearance/lltexlayer.h

indra/llappearance/llwearabletype.cpp

indra/llappearance/llwearabletype.h

indra/llcharacter/llcharacter.cpp

indra/llcharacter/lljoint.cpp

indra/llcharacter/lljoint.h

indra/llcharacter/llkeyframemotion.cpp

indra/llcommon/indra_constants.cpp

indra/llcommon/indra_constants.h

indra/llcommon/llassettype.cpp

indra/llcommon/llassettype.h