New version for October 2023

Error in pagepost.php is fixed, as previously announced.
Another problem solved, a deprecated feature of simplexmlElement::__construct also fixed (using null instead of int for #2 -$options- parameter). Similar issue with parameter #3 in preg_split, using 'null' instead of 'int', specifically in pagepost.php. These warnings occurred in php version 8.1.

Two more options added in advanced settings: One for turning off animations in the control panel and one to control file types for uploads.php. A xml file tells 'Images' page which file types to allow for upload and which for showing in the list.