#1671 Fixed lists changing not forcing validation of the elements

src/main/java/com/onarandombox/MultiverseCore/MVWorld.java

@@ -185,14 +185,22 @@ public class MVWorld implements MultiverseWorld {
         //this.props.validate();
     }
 
+    /**
+     * This method is here to provide a stopgap until the add/remove/clear methods are implemented with
+     * SerializationConfig.
+     */
+    public void validateEntitySpawns() {
+        setAllowAnimalSpawn(canAnimalsSpawn());
+        setAllowMonsterSpawn(canMonstersSpawn());
+    }
+
     private void validateProperties() {
         setPVPMode(isPVPEnabled());
         setDifficulty(getDifficulty());
         setKeepSpawnInMemory(isKeepingSpawnInMemory());
         setScaling(getScaling());
         setRespawnToWorld(this.props.getRespawnToWorld());
-        setAllowAnimalSpawn(canAnimalsSpawn());
+        validateEntitySpawns();
-        setAllowMonsterSpawn(canMonstersSpawn());
         setGameMode(getGameMode());
     }
 
@@ -543,6 +551,7 @@ public class MVWorld implements MultiverseWorld {
         if (list == null)
             return false;
         list.clear();
+        validateEntitySpawns();
         return true;
     }
 
@@ -558,6 +567,7 @@ public class MVWorld implements MultiverseWorld {
         if (list == null)
             return false;
         list.add(value);
+        validateEntitySpawns();
         return true;
     }
 
@@ -573,6 +583,7 @@ public class MVWorld implements MultiverseWorld {
         if (list == null)
             return false;
         list.remove(value);
+        validateEntitySpawns();
         return true;
     }