timesheet export (#317)

* remove autocomplete for begin and end
* fix minute display in timesheet-edit form
* toolbar form label in separate row
* added export action

src/Controller/TimesheetControllerTrait.php

@@ -92,8 +92,6 @@ trait TimesheetControllerTrait
                 $record->setEnd($end);
             }
 
-            // TODO validate that end is not before begin
-
             $entityManager = $this->getDoctrine()->getManager();
             $entityManager->persist($entry);
             $entityManager->flush();
@@ -170,8 +168,6 @@ trait TimesheetControllerTrait
                 }
             }
 
-            // TODO validate that end is not before begin
-
             $entityManager = $this->getDoctrine()->getManager();
             $entityManager->persist($entry);