Updated AgentSim/CMakeLists.txt.- Modified AgentSim/CMakeLists.txt to mirror changes made to other CMakeLists.txt to prevent deleting bin directory during clean (which caused error on subsequent build).
CMakeLists.txt clean up.- Updated all CMakeLists.txt files to remove deprecated code.- Updated MsgUtils/CMakeLists.txt to add package absl required for protobuf.