remove WorldWrapper.isEmpty()

It wasn't used and there was a comment saying not to use it

src/main/java/com/seibel/lod/core/wrapperInterfaces/world/IWorldWrapper.java

@@ -46,10 +46,6 @@ public interface IWorldWrapper extends IBindable
 	
 	boolean hasSkyLight();
 	
-	// Pls don't use this
-	// If the world is null then this can't be called and gives an error
-	boolean isEmpty();
-	
 	int getHeight();
 	
 	int getSeaLevel();