Hide unfinished features in release mode

lib/view/pages/files/fileElement.dart

@@ -168,7 +168,7 @@ class _FileElementState extends State<FileElement> {
                 },
               ),
               Visibility(
-                visible: kReleaseMode,
+                visible: !kReleaseMode,
                 child: ListTile(
                   leading: const Icon(Icons.share_outlined),
                   title: const Text("Teilen"),

lib/view/pages/timetable/appointmentDetails.dart

@@ -75,7 +75,7 @@ class AppointmentDetails {
                 leading: const Icon(Icons.person),
                 title: Text("Lehrkraft: (${timetableData.te[0].name}) ${timetableData.te[0].longname}"),
                 trailing: Visibility(
-                  visible: kReleaseMode,
+                  visible: !kReleaseMode,
                   child: IconButton(
                     icon: const Icon(Icons.textsms_outlined),
                     onPressed: () {

lib/view/settings/settings.dart

@@ -1,5 +1,6 @@
 
 import 'package:filesize/filesize.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:package_info/package_info.dart';
 import 'package:provider/provider.dart';
@@ -229,7 +230,9 @@ class _SettingsState extends State<Settings> {
               visible: settings.val().devToolsEnabled,
               child: Column(
                 children: [
-                  ListTile(
+                  Visibility(
+                    visible: !kReleaseMode,
+                    child: ListTile(
                       leading: const Icon(Icons.logo_dev_outlined),
                       title: const Text("Logging verbosity"),
                       trailing: DropdownButton<String>(
@@ -240,6 +243,7 @@ class _SettingsState extends State<Settings> {
                         },
                       ),
                     ),
+                  ),
                   ListTile(
                     leading: const CenteredLeading(Icon(Icons.image_outlined)),
                     title: const Text("Cached Thumbnails löschen"),