Refactored delayed event from BaseSubscriber out into own handler class DelayedEvent.
Fix casing in class name DcGeneral\Contao\Callback\Callbacks.
Utilize DcGeneral\Contao\View\Contao2BackendView\IdSerializer in breadcrumbs.
Refactor filtering of filter settings by fid into event handling.
Remove obsolete method Filter::getSubTemplates(DC_General $dc)
Remove TODO entry.
Fix language file for tl_metamodel_rendersetting - it was referring to "filters".