Tag to be used with the master and 23.0 branches of atlas/athena. Update(s) since 2.0.159: - Changed all documentation to use "main" instead of "master"; - Taught the dictionary generation CMake code about system includes; - Made ATLAS library builds wait for public header installations; - Removed the HEPUtils and MCUtils packages, as these are no longer used in atlas/athena; - Upgraded onnxruntime to version 1.15.1.