Deprecate SetEmergency

Author: Sharpe49

Source/Orts.Simulation/Common/Scripting/TrainControlSystem.cs

@@ -517,7 +517,8 @@ public virtual void HandleEvent(PowerSupplyEvent evt, string message) { }
         /// <summary>
         /// Called by signalling code externally to stop the train in certain circumstances.
         /// </summary>
-        public abstract void SetEmergency(bool emergency);
+        [Obsolete("SetEmergency method is deprecated, use HandleEvent(TCSEvent, string) instead")]
+        public virtual void SetEmergency(bool emergency) { }
         /// <summary>
         /// Called when player has requested a game save. 
         /// Set at virtual to keep compatibility with scripts not providing this method.

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/TrainControlSystem.cs

@@ -141,7 +141,9 @@ protected set
                 simulatorEmergencyBraking = value;
 
                 if (Script != null)
+#pragma warning disable CS0618 // SetEmergency is obsolete
                     Script.SetEmergency(value);
+#pragma warning restore CS0618 // SetEmergency is obsolete
                 else
                     Locomotive.TrainBrakeController.TCSEmergencyBraking = value;
             }
@@ -1222,12 +1224,15 @@ public override void HandleEvent(TCSEvent evt, string message)
                 case TCSEvent.AlerterReleased:
                     ResetButtonPressed = false;
                     break;
-            }
-        }
 
-        public override void SetEmergency(bool emergency)
-        {
-            ExternalEmergency = emergency;
+                case TCSEvent.EmergencyBrakingRequestedBySimulator:
+                    ExternalEmergency = true;
+                    break;
+
+                case TCSEvent.EmergencyBrakingReleasedBySimulator:
+                    ExternalEmergency = false;
+                    break;
+            }
         }
 
         void UpdateVigilance()