Merge branch 'master' into pb_multiapps_merge

.gitlab-ci.yml

CMakeLists.txt

doc/changes/state_trackers/mr.379.md

src/external/CMakeLists.txt

src/external/Catch2/catch/catch.hpp

src/xrt/auxiliary/math/m_api.h

src/xrt/auxiliary/math/m_base.cpp

src/xrt/include/xrt/meson.build

src/xrt/include/xrt/xrt_device.h

src/xrt/state_trackers/oxr/CMakeLists.txt

src/xrt/state_trackers/oxr/meson.build

src/xrt/state_trackers/oxr/oxr_input.c

src/xrt/state_trackers/oxr/oxr_input_transform.c

src/xrt/state_trackers/oxr/oxr_input_transform.h

src/xrt/state_trackers/oxr/oxr_objects.h

src/xrt/state_trackers/oxr/oxr_session.c

tests/CMakeLists.txt

tests/tests_input_transform.cpp

tests/tests_main.cpp