Implement settings

flutter/lib/pages/subscription_list/subscription_list_item.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
-import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 import 'package:simplecloudnotifier/models/channel.dart';
 import 'package:simplecloudnotifier/models/subscription.dart';
@@ -15,8 +14,6 @@ enum SubscriptionListItemMode {
 }
 
 class SubscriptionListItem extends StatelessWidget {
-  static final _dateFormat = DateFormat('yyyy-MM-dd HH:mm'); //TODO setting
-
   const SubscriptionListItem({
     required this.item,
     required this.userCache,