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

src/de/miaurizius/jgame2d/tile/interactive/MetalPlateIT.java

@@ -0,0 +1,26 @@
+package de.miaurizius.jgame2d.tile.interactive;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+
+public class MetalPlateIT extends InteractiveTile {
+
+    GamePanel panel;
+
+    public MetalPlateIT(GamePanel panel, int col, int row) {
+        super(panel, col, row);
+        this.panel = panel;
+        this.name = "metal_plate";
+
+        this.worldX = panel.tileSize * col;
+        this.worldY = panel.tileSize * row;
+
+        down1 = initEntitySprites("/interactive_tiles/metalplate");
+
+        solidArea.x = 0;
+        solidArea.y = 0;
+        solidArea.width = 0;
+        solidArea.height = 0;
+        solidAreaDefaultX = 0;
+        solidAreaDefaultY = 0;
+    }
+}