boolean hasZPM() and hasBox() added to Tile.java.

cicaprojekt/Tile.java

@@ -71,4 +71,15 @@ public abstract class Tile {
     public String toString() {
         return String.format("%d, %d", x, y);
     }
+    
+    public boolean hasZPM() {
+        if(zpmOnTile == null)
+            return false;
+        else
+            return true;
+    }
+    
+    public boolean hasBox() {
+        return boxStack.isEmpty();
+    }
 }