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/Entity/InternalSetting.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Entity;
+
+use Craue\ConfigBundle\Entity\BaseSetting;
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * InternalSetting.
+ *
+ * Re-define setting so we can override length attribute to fix utf8mb4 issue.
+ *
+ * @ORM\Entity(repositoryClass="Craue\ConfigBundle\Repository\SettingRepository")
+ * @ORM\Table(name="`internal_setting`")
+ * @ORM\AttributeOverrides({
+ *      @ORM\AttributeOverride(name="name",
+ *          column=@ORM\Column(
+ *              length = 191
+ *          )
+ *      ),
+ *      @ORM\AttributeOverride(name="section",
+ *          column=@ORM\Column(
+ *              length = 191
+ *          )
+ *      )
+ * })
+ */
+class InternalSetting extends BaseSetting
+{
+    /**
+     * @var string|null
+     *
+     * @ORM\Column(name="value", type="string", nullable=true, length=191)
+     */
+    protected $value;
+}