Added early basic media viewing in Talk

lib/screen/settings/debug/debugOverview.dart

@@ -31,6 +31,7 @@ class _DebugOverviewState extends State<DebugOverview> {
             leading: const Icon(Icons.delete_forever),
             title: const Text("Cache löschen"),
             onTap: () {
+              PaintingBinding.instance.imageCache.clear();
               storage.collection("MarianumMobile").delete().then((value) => {
                 Navigator.pop(context)
               });