Merge branch 'feature_UpgradeTo9LTS' into 'master'

Classes/Controller/BackendController.php

Classes/Controller/JoblistController.php

Classes/Domain/Model/FileReference.php

Classes/Domain/Model/JobApplication.php

Classes/Domain/Repository/JobRepository.php

...Property/TypeConverter/UploadedFileReferenceConverter.php

Classes/Routing/Aspect/JobTitleMapper.php

Classes/Service/BackendService.php

Classes/Service/TcaItemsProcessor.php

Classes/ViewHelpers/Backend/ControlViewHelper.php

Classes/ViewHelpers/Backend/EditLinkViewHelper.php

Classes/ViewHelpers/Backend/EditOnClickViewHelper.php

Classes/ViewHelpers/Backend/IconViewHelper.php

Classes/ViewHelpers/Backend/Widget/PaginateViewHelper.php

Classes/ViewHelpers/ExtendedIfViewHelper.php

Classes/ViewHelpers/Form/UploadViewHelper.php

Classes/ViewHelpers/PageBrowserViewHelper.php

Classes/ViewHelpers/SetViewHelper.php

Configuration/TCA/Overrides/sys_template.php

Configuration/TCA/Overrides/tt_content.php