main script to also initilize the environment so that tests run. TODO now code would no accept multiple runs

correction in main script so that it can run for infinite time. Problem that SimPy3 does not set env.now to last event, so reading from the last exit brought back there

Machine, if no router is initiated then the pendingEntities list is not populated by endProcessingActions(). getActiveObject() used less to speed up

Exit, if no router is initiated the removeEntity() does not remove entities from pendingEntities list. Static clear() not used for the moment