Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

src/Event/Subscriber/SQLiteCascadeDeleteSubscriber.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace App\Event\Subscriber;
+
+use App\Entity\Entry;
+use Doctrine\Common\EventSubscriber;
+use Doctrine\DBAL\Platforms\SqlitePlatform;
+use Doctrine\ORM\Event\LifecycleEventArgs;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * SQLite doesn't care about cascading remove, so we need to manually remove associated stuf for an Entry.
+ * Foreign Key Support can be enabled by running `PRAGMA foreign_keys = ON;` at runtime (AT RUNTIME !).
+ * But it needs a compilation flag that not all SQLite instance has ...
+ *
+ * @see https://www.sqlite.org/foreignkeys.html#fk_enable
+ */
+class SQLiteCascadeDeleteSubscriber implements EventSubscriber
+{
+    private $doctrine;
+
+    public function __construct(ManagerRegistry $doctrine)
+    {
+        $this->doctrine = $doctrine;
+    }
+
+    /**
+     * @return array
+     */
+    public function getSubscribedEvents()
+    {
+        return [
+            'preRemove',
+        ];
+    }
+
+    /**
+     * We removed everything related to the upcoming removed entry because SQLite can't handle it on it own.
+     * We do it in the preRemove, because we can't retrieve tags in the postRemove (because the entry id is gone).
+     */
+    public function preRemove(LifecycleEventArgs $args)
+    {
+        $entity = $args->getEntity();
+        if (!$this->doctrine->getConnection()->getDatabasePlatform() instanceof SqlitePlatform
+            || !$entity instanceof Entry) {
+            return;
+        }
+
+        $em = $this->doctrine->getManager();
+
+        if (null !== $entity->getTags()) {
+            foreach ($entity->getTags() as $tag) {
+                $entity->removeTag($tag);
+            }
+        }
+
+        if (null !== $entity->getAnnotations()) {
+            foreach ($entity->getAnnotations() as $annotation) {
+                $em->remove($annotation);
+            }
+        }
+
+        $em->flush();
+    }
+}