added annotation based exporter (#1831)

* added user exporter
* added project exporter
* added customer exporter
* added activity exporter

src/Entity/ColorTrait.php

@@ -9,6 +9,7 @@
 
 namespace App\Entity;
 
+use App\Export\Annotation as Exporter;
 use Doctrine\ORM\Mapping as ORM;
 use JMS\Serializer\Annotation as Serializer;
 use Symfony\Component\Validator\Constraints as Assert;
@@ -23,6 +24,8 @@ trait ColorTrait
      * @Serializer\Expose()
      * @Serializer\Groups({"Default"})
      *
+     * @Exporter\Expose(label="label.color")
+     *
      * @ORM\Column(name="color", type="string", length=7, nullable=true)
      * @Assert\Length(min=4, max=7)
      */