Remove deprecated code

Deprecation Notice: Using the "Twig_Loader_Array" class is deprecated since Twig version 2.7, use "Twig\Loader\ArrayLoader" instead. in /drupal/vendor/twig/twig/lib/Twig/Loader/Array.php:7
Deprecation Notice: Using the "Twig_Environment" class is deprecated since Twig version 2.7, use "Twig\Environment" instead. in /drupal/vendor/twig/twig/lib/Twig/Environment.php:7

added Doing label

changed the description

assigned to @jurgenhaas

mentioned in commit e1931d4b

closed

removed Doing label