Update to Symfony 4.1 #149 (#160)

* updated to Symfony 4.1 #149
* updated to phpunit 7 #149
* downgrade ocramius/proxy-manager for PHP 7.1 compatibility #149
* fixed symfony deprecations #149
* replaced AdvancedUserInterface with custom user checker
* code sniffer fixes

src/Controller/TimesheetControllerTrait.php

@@ -134,9 +134,9 @@ trait TimesheetControllerTrait
                 }
             }
 
-			// TODO validate that end is not before begin
+            // TODO validate that end is not before begin
 
-			$entityManager = $this->getDoctrine()->getManager();
+            $entityManager = $this->getDoctrine()->getManager();
             $entityManager->persist($entry);
 
             $entityManager->flush();