Why exclude special characters "{ } :" for Account Name

[jpdup]

In the flutter version we use ':' to tokenize the names for Category and Account, it has the benefit of doing nice rendering like this.

Looking at the code for Account dialog, the name is not allowed to have ':', Is this a legacy reason for serialization ? Would this limitation also be applicable to Category names ? which is allowed to have ':'

Can we remove this limitation?

private static readonly char[] InvalidNameChars = new char[] { '{', '}', ':' };

  private void OnNameChanged(object sender, TextChangedEventArgs e)
  {
      this.CheckButtonStates();

      if (this.TextBoxName.Text.IndexOfAny(InvalidNameChars) >= 0)
      {
          this.TextBoxName.Background = Brushes.Red;
          this.TextBoxName.ToolTip = Walkabout.Properties.Resources.AccountNameValidChars;
          this.ButtonOk.IsEnabled = false;
      }
      else
      {
          this.TextBoxName.ClearValue(TextBox.BackgroundProperty);
          this.TextBoxName.ToolTip = "";
      }
  }

[clovett]

Because the account name has to also be a valid windows folder name because that's where we store the statements and attachments.