[2.8] FormExtensionFixer

[althaus]

Hey,

another one very similar to the FormTypeFixer. Upgrading form type extensions:

Before:

class MyTypeExtension extends AbstractTypeExtension
{
   public function getExtendedType()
   {
       return 'form';
   }
}

After:

use Symfony\Component\Form\Extension\Core\Type\FormType;

class MyTypeExtension extends AbstractTypeExtension
{
   public function getExtendedType()
   {
       return FormType::class;
   }
}

Cheers Matthias

[umpirsky]

Nice one, thanks. :+1: