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/Form/Toolbar/TimesheetAdminToolbarForm.php

@@ -24,6 +24,8 @@ class TimesheetAdminToolbarForm extends TimesheetToolbarForm
         $this->addTimesheetStateChoice($builder);
         $this->addPageSizeChoice($builder);
         $this->addUserChoice($builder);
+        $this->addStartDateChoice($builder);
+        $this->addEndDateChoice($builder);
         $this->addCustomerChoice($builder);
         $this->addProjectChoice($builder);
         $this->addActivityChoice($builder);