Merge branch '5.4' into 6.0

* 5.4:
  Use mb_convert_encoding instead of utf8_decode
  [FrameworkBundle] Always add CacheCollectorPass
  Fix "Notice: Undefined index: headers" in messenger with Oracle
  [String] Fix ansi escape sequences regex
  Indicate support for doctrine/persistence 3
  [Routing] fix router base url when default uri has trailing slash
  Replace deprecated String.prototype.substr()

Tests/Loader/XliffFileLoaderTest.php

@@ -116,12 +116,12 @@ public function testEncoding()
         $loader = new XliffFileLoader();
         $catalogue = $loader->load(__DIR__.'/../fixtures/encoding.xlf', 'en', 'domain1');
 
-        $this->assertEquals(utf8_decode('föö'), $catalogue->get('bar', 'domain1'));
-        $this->assertEquals(utf8_decode('bär'), $catalogue->get('foo', 'domain1'));
+        $this->assertEquals(mb_convert_encoding('föö', 'ISO-8859-1', 'UTF-8'), $catalogue->get('bar', 'domain1'));
+        $this->assertEquals(mb_convert_encoding('bär', 'ISO-8859-1', 'UTF-8'), $catalogue->get('foo', 'domain1'));
         $this->assertEquals(
             [
                 'source' => 'foo',
-                'notes' => [['content' => utf8_decode('bäz')]],
+                'notes' => [['content' => mb_convert_encoding('bäz', 'ISO-8859-1', 'UTF-8')]],
                 'id' => '1',
                 'file' => [
                     'original' => 'file.ext',