[TASK] Rector, ECS

...entListeners/PageContentPreviewRenderingEventListener.php

Classes/ViewHelpers/AbstractViewHelper.php

Classes/ViewHelpers/Backend/CompanyLabelViewHelper.php

Classes/ViewHelpers/Backend/ControlViewHelper.php

Classes/ViewHelpers/Backend/IconViewHelper.php

Classes/ViewHelpers/ExplodeStringViewHelper.php

Classes/ViewHelpers/Form/UploadViewHelper.php

Classes/ViewHelpers/PageBrowserViewHelper.php

Classes/ViewHelpers/SetViewHelper.php