Added holidays viewer

lib/storage/base/settings.dart

@@ -3,6 +3,7 @@ import 'package:json_annotation/json_annotation.dart';
 
 import '../file/fileSettings.dart';
 import '../gradeAverages/gradeAveragesSettings.dart';
+import '../holidays/holidaysSettings.dart';
 import '../talk/talkSettings.dart';
 import '../timetable/timetableSettings.dart';
 
@@ -21,6 +22,7 @@ class Settings {
   TimetableSettings timetableSettings;
   TalkSettings talkSettings;
   FileSettings fileSettings;
+  HolidaysSettings holidaysSettings;
 
   Settings({
     required this.appTheme,
@@ -29,6 +31,7 @@ class Settings {
     required this.timetableSettings,
     required this.talkSettings,
     required this.fileSettings,
+    required this.holidaysSettings,
   });
 
   static String _themeToJson(ThemeMode m) => m.name;