Let user configure how censorString works

[MekDrop]

Instead adding stub like, that can be not available in non @ImpressCMS to give a possibility to with some Facade class configure providing special class that implements interface that let's change censor string provider/functionality:

if (!class_exists('icms_core_DataFilter')) {
    class icms_core_DataFilter
    {
        public static function censorString(string $text): string
        {
            return $text;
        }
    }
}