Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.63: - Updated MCUtils to version 1.3.4; - Fixed the (standalone) build of Boost on macOS Catalina; - Updated Acts to version v0.22.00, and switched to picking it up from GitHub; - Turned off the unit tests for onnxruntime, thereby fixing its Clang 9 build.