removed old marianum message structure

lib/main.dart

@@ -25,7 +25,6 @@ import 'model/chatList/chatListProps.dart';
 import 'model/chatList/chatProps.dart';
 import 'model/files/filesProps.dart';
 import 'model/holidays/holidaysProps.dart';
-import 'model/message/messageProps.dart';
 import 'model/timetable/timetableProps.dart';
 import 'storage/base/settingsProvider.dart';
 import 'theming/darkAppTheme.dart';
@@ -71,7 +70,6 @@ Future<void> main() async {
           ChangeNotifierProvider(create: (context) => ChatProps()),
           ChangeNotifierProvider(create: (context) => FilesProps()),
 
-          ChangeNotifierProvider(create: (context) => MessageProps()),
           ChangeNotifierProvider(create: (context) => HolidaysProps()),
         ],
         child: const Main(),