Merge branch 'master' into 'feature/#452_device_abstraction'

.gitlab-ci.yml

cmake/WarningLevels.cmake

cmake/suppress_warnings.hpp.in

demos/viewer/src/viewer_system.hpp

library/phx/core/engine.hpp

library/phx/input/input_system.hpp

library/phx/input/openvr_controller_behavior.hpp

library/phx/rendering/auxiliary/splash_screen.hpp

library/phx/rendering/backend/render_target.hpp

library/phx/rendering/backend/shader_program.hpp

library/phx/rendering/components/light.hpp

library/phx/rendering/render_passes/geometry_pass.hpp

library/phx/resources/loaders/assimp_model_loader.hpp

library/phx/resources/resource_utils.cpp

library/phx/resources/resource_utils.hpp

library/phx/scripting/behavior_system.hpp

library/phx/utility/stream_helpers.hpp

tests/src/mocks/openvr_mock.hpp

tests/src/test_resource_utils.cpp

tests/test_utilities/approx.hpp