Rename read/write to receive/send

ros2rag.safety/src/main/jastadd/SafetyModel.connect

 /* Version 2020-07-15  */
 // --- update definitions ---
-read Link.CurrentPosition using ParseRobotState, RobotStateToIntPosition ;
-write RobotArm.AppropriateSpeed using CreateSpeedMessage, SerializeRobotConfig ;
+receive Link.CurrentPosition using ParseRobotState, RobotStateToIntPosition ;
+send RobotArm.AppropriateSpeed using CreateSpeedMessage, SerializeRobotConfig ;
 
 // --- dependency definitions ---
 RobotArm.AppropriateSpeed canDependOn Link.CurrentPosition as dependency1 ;