Add entity- and tileentity-sensitive versions of Spell#canBeCastByNPCs and Spell#canBeCastByDispensers

src/main/java/electroblob/wizardry/spell/WitherSkull.java

@@ -33,7 +33,7 @@ public class WitherSkull extends Spell {
 	}
 
 	@Override
-	public boolean canBeCastByNPCs(){
+	public boolean canBeCastBy(EntityLiving npc, boolean override){
 		return true;
 	}