Merge branch 'main' of https://github.com/secondlife/viewer into roxie/webrtc-voice

.github/workflows/build.yaml

.github/workflows/cla.yaml

.github/workflows/stale.yaml

BuildParams

autobuild.xml

build.sh

doc/contributions.txt

doc/testplans/optimize_away_alpha.md

indra/fix-incredibuild.py

indra/llappearance/llavatarappearance.cpp

indra/llaudio/llaudioengine.cpp

indra/llcommon/classic_callback.h

indra/llcommon/indra_constants.cpp

indra/llcommon/indra_constants.h

indra/llcommon/llapp.cpp

indra/llcommon/llapp.h

indra/llcommon/llbase64.cpp

indra/llcommon/llcoros.cpp

indra/llcommon/lldictionary.h

indra/llcommon/lldoubledispatch.h