Sort form sections, questions and options by OrderNumber

[aniri]

The new OrderNumber field is returned by the API. It should be used to sort the form data (form sections, for questions and options for questions) :)

[pedrofsn]

I didn't find this class.
I could help in this task.

[aniri]

I didn't find this class.
I could help in this task.

@pedrofsn thanks for your interest, but this task is already fixed in a PR waiting for review 😃