updated chatTextfield.dart design and added file and gallery picker

lib/screen/pages/talk/chatList.dart

@@ -5,6 +5,7 @@ import 'package:jiffy/jiffy.dart';
 import 'package:marianum_mobile/api/marianumcloud/talk/chat/richObjectStringProcessor.dart';
 import 'package:marianum_mobile/api/marianumcloud/talk/room/getRoomResponse.dart';
 import 'package:marianum_mobile/data/chatList/chatListProps.dart';
+import 'package:persistent_bottom_nav_bar/persistent_tab_view.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -91,13 +92,11 @@ class _ChatListState extends State<ChatList> {
               ),
               leading: circleAvatar,
               onTap: () async {
-                Navigator.of(context).push(MaterialPageRoute(builder: (context) {
-                  return ChatView(
-                    room: chatRoom,
-                    selfId: username,
-                    avatar: circleAvatar,
-                  );
-                }));
+                PersistentNavBarNavigator.pushNewScreen(
+                    context,
+                    screen: ChatView(room: chatRoom, selfId: username, avatar: circleAvatar),
+                    withNavBar: false
+                );
               },
             ));
           }