Added option to share the app via qr-code

lib/view/pages/more/overhang.dart

@@ -1,7 +1,6 @@
 
 import 'package:flutter/material.dart';
 import 'package:persistent_bottom_nav_bar/persistent_tab_view.dart';
-import 'package:share_plus/share_plus.dart';
 
 import '../../../widget/ListItem.dart';
 import '../../settings/settings.dart';
@@ -9,6 +8,7 @@ import 'gradeAverages/gradeAverage.dart';
 import 'holidays/holidays.dart';
 import 'message/message.dart';
 import 'roomplan/roomplan.dart';
+import 'share/selectShareTypeDialog.dart';
 
 class Overhang extends StatelessWidget {
   const Overhang({Key? key}) : super(key: key);
@@ -33,20 +33,8 @@ class Overhang extends StatelessWidget {
           ListTile(
             leading: const Icon(Icons.share_outlined),
             title: const Text("Teile die App"),
-            onTap: () {
-              Share.share(
-                sharePositionOrigin: Rect.fromCenter(
-                  center: const Offset(0, 0),
-                  width: 0,
-                  height: 0,
-                ),
-                subject: "App Teilen",
-                "Hol dir die für das Marianum maßgeschneiderte App:"
-                "\n\nAndroid: https://play.google.com/store/apps/details?id=eu.mhsl.marianum.mobile.client "
-                "\niOS: https://apps.apple.com/us/app/marianum-fulda/id6458789560 "
-                "\n\nViel Spaß!"
-              );
-            },
+            trailing: const Icon(Icons.arrow_right),
+            onTap: () => showDialog(context: context, builder: (context) => const SelectShareTypeDialog())
           ),
         ],
       ),