added connected double lessons with own setting

lib/view/settings/defaultSettings.dart

@@ -22,7 +22,9 @@ class DefaultSettings {
           askedForPreferredGradeSystem: false,
           inputs: []
       ),
-      timetableSettings: TimetableSettings(),
+      timetableSettings: TimetableSettings(
+        connectDoubleLessons: false,
+      ),
       talkSettings: TalkSettings(
         sortFavoritesToTop: true,
         sortUnreadToTop: false,

lib/view/settings/settings.dart

@@ -98,6 +98,19 @@ class _SettingsState extends State<Settings> {
 
             const Divider(),
 
+            ListTile(
+              leading: const Icon(Icons.calendar_view_day_outlined),
+              title: const Text("Doppelstunden als eine Stunde anzeigen"),
+              trailing: Checkbox(
+                value: settings.val().timetableSettings.connectDoubleLessons,
+                onChanged: (e) {
+                  settings.val(write: true).timetableSettings.connectDoubleLessons = e!;
+                },
+              ),
+            ),
+
+            const Divider(),
+
             ListTile(
               leading: const Icon(Icons.star_border),
               title: const Text("Favoriten im Talk nach oben sortieren"),