buildTree method
Implementation
Future<List<TreeNode<VEntity>>> buildTree(BuildContext context) async {
  List<TreeNode<VEntity>> nodes = [];
  VFS vfs = context.vfs;
  VFolder root = vfs.root;
  VFolder wd = (await vfs.getEntity(vfs.workingDirectory)) as VFolder;
  nodes.add(TreeRoot<VEntity>(children: [
    ...(await root.treeNode(context, addChildren: true)).children,
  ]));
  print("Nodes: ${nodes.length}");
  return nodes;
}