add BigRockNPC and IronDoorObj; update AssetSetter to include new NPC and interactive tiles

src/de/miaurizius/jgame2d/entity/obstacle/ChestObj.java

@@ -28,6 +28,7 @@ public class ChestObj extends Entity {
         solidAreaDefaultY = solidArea.y;
     }
 
+    @Override
     public void setDialogue() {
         dialogue[0][0] = "You open the chest and find a " + loot.name + "!\nBut your inventory is full...";
         dialogue[1][0] = "You open the chest and find a " + loot.name + "!\nYou obtain the " + loot.name + "!";