device group (#10781)

1. Rename `Group` tab to `Accessible devices`
2. Add accessible device groups at the top of search list
3. option `preset-device-group-name` and command line `--assign --device_group_name`

Signed-off-by: 21pages <sunboeasy@gmail.com>

flutter/lib/models/peer_tab_model.dart

@@ -28,14 +28,14 @@ class PeerTabModel with ChangeNotifier {
     'Favorites',
     'Discovered',
     'Address book',
-    'Group',
+    'Accessible devices',
   ];
   static const List<IconData> icons = [
     Icons.access_time_filled,
     Icons.star,
     Icons.explore,
     IconFont.addressBook,
-    Icons.group,
+    IconFont.deviceGroupFill,
   ];
   List<bool> isEnabled = List.from([
     true,