fixed sorting for filter options see #529
Merge pull request #542 from Zeromax/fix-filter-sorting

fixed sorting for filter options see #529
Fix: $event->getDispatcher() is deprecated.
Refactoring: reduce cyclomatic complexity of parsePanels().
Fix some notices.
Fix some more notices.
Fix some more notices.
Optimize loading of child tables by moving unneccessary stuff out of the loop.
Fix further notices.
Fix issue #552 - Warning thrown in templates.
Add label for the sorting property of items.
Fix issue #561 - auto_item parameter is added to the URL.
Refactor building of filter urls in simple filter setting.
Add test cases for simple filter setting to test against #561 and others.
Addendum to #561 - further problems with auto_item adding.
Missing comma
Merge pull request #563 from c4y/tng

Missing comma
Drop deprecated Symfony\Component\EventDispatcher\Event::getDispatcher().