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

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

@@ -0,0 +1,36 @@
+package de.miaurizius.jgame2d.entity.obstacle;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+import de.miaurizius.jgame2d.core.enums.EntityType;
+import de.miaurizius.jgame2d.entity.Entity;
+
+public class IronDoorObj extends Entity {
+    GamePanel panel;
+
+    public IronDoorObj(GamePanel panel) {
+        super(panel);
+        this.panel = panel;
+        name = "door";
+        type = EntityType.OBSTACLE;
+        down1 = initEntitySprites("objects/door_iron");
+        collision = true;
+
+        solidArea.x = 0;
+        solidArea.y = 16;
+        solidArea.width = 48;
+        solidArea.height = 32;
+        solidAreaDefaultX = solidArea.x;
+        solidAreaDefaultY = solidArea.y;
+
+        setDialogue();
+    }
+
+    public void setDialogue() {
+        dialogue[0][0] = "It won't budge.";
+    }
+
+    @Override
+    public void interact() {
+        startDialogue(this,0);
+    }
+}