Replace Ember app with Mithril app

js/lib/utils/app.js

@@ -0,0 +1,21 @@
+import ItemList from 'flarum/utils/item-list';
+
+class App {
+  constructor() {
+    this.initializers = new ItemList();
+    this.cache = {};
+  }
+
+  boot() {
+    this.initializers.toArray().forEach((initializer) => initializer(this));
+  }
+
+  route(name, args, queryParams) {
+    var queryString = m.route.buildQueryString(queryParams);
+    return this.routes[name][0].replace(/:([^\/]+)/g, function(m, t) {
+      return typeof args[t] === 'function' ? args[t]() : args[t];
+    }) + (queryString ? '?'+queryString : '');
+  }
+}
+
+export default App;