Added Talk chat hyperlink recognition and open browser on tap

lib/screen/pages/talk/chatMessage.dart

@@ -2,8 +2,10 @@ import 'dart:convert';
 
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_linkify/flutter_linkify.dart';
 import 'package:marianum_mobile/api/marianumcloud/talk/chat/richObjectStringProcessor.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:url_launcher/url_launcher_string.dart';
 
 import '../../../api/marianumcloud/talk/chat/getChatResponse.dart';
 
@@ -29,7 +31,10 @@ class ChatMessage {
     SharedPreferences preferences = await SharedPreferences.getInstance();
 
     if(file == null) {
-      return SelectableText(content);
+      return SelectableLinkify(
+        text: content,
+        onOpen: onOpen,
+      );
     }
 
     return CachedNetworkImage(
@@ -47,4 +52,12 @@ class ChatMessage {
       },
     );
   }
+
+  void onOpen(LinkableElement link) async {
+    if(await canLaunchUrlString(link.url)) {
+      await launchUrlString(link.url);
+    } else {
+
+    }
+  }
 }