expose resetScene and getSceneElementsIncludingDeleted && move excalidrawApp to excalidraw-app folder (#2272)

Co-authored-by: dwelle <luzar.david@gmail.com>

src/excalidraw-app/pwa.ts

@@ -0,0 +1,31 @@
+import { register as registerServiceWorker } from "../serviceWorker";
+import { EVENT } from "../constants";
+
+// On Apple mobile devices add the proprietary app icon and splashscreen markup.
+// No one should have to do this manually, and eventually this annoyance will
+// go away once https://bugs.webkit.org/show_bug.cgi?id=183937 is fixed.
+if (
+  /\b(iPad|iPhone|iPod)\b/.test(navigator.userAgent) &&
+  !matchMedia("(display-mode: standalone)").matches
+) {
+  import(/* webpackChunkName: "pwacompat" */ "pwacompat");
+}
+
+registerServiceWorker({
+  onUpdate: (registration) => {
+    const waitingServiceWorker = registration.waiting;
+    if (waitingServiceWorker) {
+      waitingServiceWorker.addEventListener(
+        EVENT.STATE_CHANGE,
+        (event: Event) => {
+          const target = event.target as ServiceWorker;
+          const state = target.state as ServiceWorkerState;
+          if (state === "activated") {
+            window.location.reload();
+          }
+        },
+      );
+      waitingServiceWorker.postMessage({ type: "SKIP_WAITING" });
+    }
+  },
+});