Re-implement UI reskin with working legacy toggle

Re-implement UI reskin with working legacy toggle; add return to title option to menu

src/ui/biome-select-ui-handler.ts

@@ -5,7 +5,7 @@ import { addTextObject, TextStyle } from "./text";
 import { Mode } from "./ui";
 import UiHandler from "./ui-handler";
 import * as Utils from "../utils";
-import { addWindow } from "./window";
+import { addWindow } from "./ui-theme";
 
 export default class BiomeSelectUiHandler extends UiHandler {
   private biomeSelectContainer: Phaser.GameObjects.Container;