migration symfony 5 4 (#300)

* symfony 5.4 (diff dev)

* symfony 5.4 (working)

* symfony 5.4 (update autoload)

* symfony 5.4 (remove swiftmailer mailer implementation)

* symfony 5.4 (php doc and split Global accessor class)


### Impacted packages:

composer require php:">=7.2.5 <8.0.0" symfony/console:5.4.* symfony/dotenv:5.4.* symfony/framework-bundle:5.4.* symfony/twig-bundle:5.4.* symfony/yaml:5.4.* --update-with-dependencies

composer require symfony/stopwatch:5.4.* symfony/web-profiler-bundle:5.4.* --dev --update-with-dependencies

lib/symfony/routing/Loader/Configurator/ImportConfigurator.php

@@ -18,6 +18,8 @@ use Symfony\Component\Routing\RouteCollection;
  */
 class ImportConfigurator
 {
+    use Traits\HostTrait;
+    use Traits\PrefixTrait;
     use Traits\RouteTrait;
 
     private $parent;
@@ -28,6 +30,19 @@ class ImportConfigurator
         $this->route = $route;
     }
 
+    /**
+     * @return array
+     */
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         $this->parent->addCollection($this->route);
@@ -36,13 +51,39 @@ class ImportConfigurator
     /**
      * Sets the prefix to add to the path of all child routes.
      *
-     * @param string $prefix
+     * @param string|array $prefix the prefix, or the localized prefixes
      *
      * @return $this
      */
-    final public function prefix($prefix)
+    final public function prefix($prefix, bool $trailingSlashOnRoot = true): self
     {
-        $this->route->addPrefix($prefix);
+        $this->addPrefix($this->route, $prefix, $trailingSlashOnRoot);
+
+        return $this;
+    }
+
+    /**
+     * Sets the prefix to add to the name of all child routes.
+     *
+     * @return $this
+     */
+    final public function namePrefix(string $namePrefix): self
+    {
+        $this->route->addNamePrefix($namePrefix);
+
+        return $this;
+    }
+
+    /**
+     * Sets the host to use for all child routes.
+     *
+     * @param string|array $host the host, or the localized hosts
+     *
+     * @return $this
+     */
+    final public function host($host): self
+    {
+        $this->addHost($this->route, $host);
 
         return $this;
     }