added ability set unmountable entities

src/main/java/carpet/mixins/Entity_scarpetEventsMixin.java

@@ -14,6 +14,8 @@ public abstract class Entity_scarpetEventsMixin implements EntityInterface
 {
     @Shadow public boolean removed;
 
+    private boolean permanentVehicle;
+
     private final EntityEventsGroup events = new EntityEventsGroup();
 
     @Override
@@ -22,6 +24,18 @@ public abstract class Entity_scarpetEventsMixin implements EntityInterface
         return events;
     }
 
+    @Override
+    public boolean isPermanentVehicle()
+    {
+        return permanentVehicle;
+    }
+
+    @Override
+    public void setPermanentVehicle(boolean permanent)
+    {
+        permanentVehicle = permanent;
+    }
+
     @Inject(method = "tick", at = @At("HEAD"))
     private void onTickCall(CallbackInfo ci)
     {
@@ -34,4 +48,6 @@ public abstract class Entity_scarpetEventsMixin implements EntityInterface
     {
         if (!removed) events.onEvent(EntityEventsGroup.EntityEventType.ON_REMOVED, (Entity) (Object) this);
     }
+
+
 }