Made Settings persistent with autosave

lib/model/appTheme.dart

@@ -1,36 +0,0 @@
-import 'package:flutter/material.dart';
-
-class AppTheme extends ChangeNotifier {
-  ThemeMode _mode = ThemeMode.system;
-  ThemeMode get getMode => _mode;
-
-  void setTheme(ThemeMode newMode) {
-    _mode = newMode;
-    notifyListeners();
-  }
-
-  static ThemeModeDisplay getDisplayOptions(ThemeMode theme) {
-    switch(theme) {
-      case ThemeMode.system:
-        return ThemeModeDisplay(icon: Icons.auto_fix_high_outlined, displayName: "Systemvorgabe");
-
-      case ThemeMode.light:
-        return ThemeModeDisplay(icon: Icons.dark_mode_outlined, displayName: "Hell");
-
-      case ThemeMode.dark:
-        return ThemeModeDisplay(icon: Icons.dark_mode, displayName: "Dunkel");
-
-    }
-  }
-
-  static bool isDarkMode(BuildContext context) {
-    return Theme.of(context).brightness == Brightness.dark;
-  }
-}
-
-class ThemeModeDisplay {
-  final IconData icon;
-  final String displayName;
-
-  ThemeModeDisplay({required this.icon, required this.displayName});
-}