cs: Switch to a stricter way of coding - this might break in a lot of places.

src/Bundle/ChillActivityBundle/Export/Aggregator/ActivityUserAggregator.php

@@ -7,6 +7,15 @@
  * the LICENSE file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
+/**
+ * Chill is a software for social workers.
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
 namespace Chill\ActivityBundle\Export\Aggregator;
 
 use Chill\ActivityBundle\Security\Authorization\ActivityStatsVoter;

src/Bundle/ChillActivityBundle/Export/Export/ListActivity.php

@@ -206,7 +206,7 @@ class ListActivity implements ListInterface
             ->setParameter('authorized_centers', $centers);
 
         foreach ($this->fields as $f) {
-            if (in_array($f, $data['fields'])) {
+            if (in_array($f, $data['fields'], true)) {
                 switch ($f) {
                     case 'id':
                         $qb->addSelect('activity.id AS id');