added project detail report (#2651)

- avatars via css only
- random colors for entities
- improves print view
- added colors for teams
- added color to tag

src/Entity/ColorTrait.php

@@ -51,12 +51,9 @@ trait ColorTrait
 
     /**
      * @param string $color
-     * @return self
      */
-    public function setColor(?string $color = null)
+    public function setColor(?string $color = null): void
     {
         $this->color = $color;
-
-        return $this;
     }
 }