added positions to behaviorparameters

Project/Assets/ML-Agents/Examples/Soccer/Prefabs/SoccerFieldFives.prefab

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com.unity.ml-agents/Editor/BehaviorParametersEditor.cs

             EditorGUI.indentLevel--;
             EditorGUILayout.PropertyField(so.FindProperty("m_BehaviorType"));
             EditorGUILayout.PropertyField(so.FindProperty("m_TeamID"));
+            EditorGUILayout.PropertyField(so.FindProperty("m_Position"));
             EditorGUILayout.PropertyField(so.FindProperty("m_UseChildSensors"), true);
             // EditorGUILayout.PropertyField(serializedObject.FindProperty("m_Heuristic"), true);
             EditorGUI.indentLevel--;

com.unity.ml-agents/Runtime/Policy/BehaviorParameters.cs

         [HideInInspector]
         [SerializeField]
         public int m_TeamID;
+        [HideInInspector]
+        [SerializeField]
+        public string m_Position;
         [FormerlySerializedAs("m_useChildSensors")]
         [HideInInspector]
         [SerializeField]
         /// </summary>
         public string fullyQualifiedBehaviorName
         {
-            get { return m_BehaviorName + "?team=" + m_TeamID; }
+            get { return m_BehaviorName + "?team=" + m_TeamID + "&position=" + m_Position; }
         }
 
         internal IPolicy GeneratePolicy(Func<float[]> heuristic)