Refactor codebase resolving warnings and remove self-package imports

lib/view/pages/more/overhang.dart

@@ -0,0 +1,36 @@
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:persistent_bottom_nav_bar/persistent_tab_view.dart';
+
+import '../../../widget/ListItem.dart';
+import '../../settings/settings.dart';
+import 'countdown/countdown.dart';
+import 'gradeAverages/gradeAverage.dart';
+import 'message/message.dart';
+import 'roomplan/roomplan.dart';
+
+class Overhang extends StatelessWidget {
+  const Overhang({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text("Mehr"),
+        actions: [
+          IconButton(onPressed: () => PersistentNavBarNavigator.pushNewScreen(context, screen: const Settings(), withNavBar: false), icon: const Icon(Icons.settings))
+        ],
+      ),
+      body: ListView(
+        children: const [
+          ListItemNavigator(icon: Icons.newspaper, text: "Marianum Message", target: Message()),
+          ListItemNavigator(icon: Icons.room, text: "Raumplan", target: Roomplan()),
+          ListItemNavigator(icon: Icons.calculate, text: "Notendurschnitts rechner", target: GradeAverage()),
+          if(!kReleaseMode) ListItemNavigator(icon: Icons.calendar_month, text: "Schulferien", target: Roomplan()),
+          if(!kReleaseMode) ListItemNavigator(icon: Icons.timer, text: "Countdown", target: Countdown()),
+        ],
+      ),
+    );
+  }
+}