Graveyard terrain and background tiles implemented

tilorswift/js/ButtonTile.js

@@ -1,8 +1,13 @@
 import Field from "./Field.js";
 import TilorswiftButtonTileClickedEvent from "./events/TilorswiftButtonTileClickedEvent.js";
+import Tileset from "./Tileset.js";
 
 export default class ButtonTile extends Field
 {
+    /**
+     * @param {Tileset} tileset 
+     * @param {number} index 
+     */
     constructor(tileset, index = 0)
     {
         super(tileset, 0, 0, index);