converted info dialog to new pattern

src/public/app/widgets/dialog.js

@@ -0,0 +1,10 @@
+import appContext from "../services/app_context.js";
+
+async function info(message) {
+    return new Promise(res =>
+        appContext.triggerCommand("showInfoDialog", {message, callback: res}));
+}
+
+export default {
+    info
+};