Merge remote-tracking branch 'origin/main' into release/gltf-maint2

.github/ISSUE_TEMPLATE/10-bug.yaml

.github/ISSUE_TEMPLATE/20-enhancement.md

.github/ISSUE_TEMPLATE/30-blank.yaml

.github/ISSUE_TEMPLATE/config.yml

.github/release.yaml

.github/workflows/cla.yaml

.gitignore

autobuild.xml

doc/contributions.txt

indra/cmake/CMakeLists.txt

indra/cmake/Copy3rdPartyLibs.cmake

indra/cmake/ICU4C.cmake

indra/cmake/ViewerMiscLibs.cmake

indra/llappearance/llwearabletype.h

indra/llcommon/CMakeLists.txt

indra/llcommon/llcoros.h

indra/llcommon/llsingleton.h

indra/llcommon/llstring.cpp

indra/llcommon/llstring.h

indra/llcommon/tests/llsingleton_test.cpp