Advanced usage: custom theme and several fields

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Up to date documentation is available in Symfony 3.x website (see the dropdown menu above).

An example that shows how works theming on a form with more than one field.

This demostration is made of the following files (click to see on GitHub in a new tab):
    -     Controller/AdvancedController.php
    -     Entity/Address.php
    -     Entity/Addresses.php
    -     Form/AddressType.php
    -     Form/AddressesType.php
    -     Resources/views/Advanced/addressesTheme.html.twig
    -     Resources/views/Advanced/formHavingSeveralFields.html.twig