* Fixed: Outlook 2019 compatibility issues
* Fixed: image rendering issue with certain SVG formats
* Fixed: improved loading performance
* Fixed: duplicate CSS after saving
* Fixed: PHP 8.1 compatibility issue with sample code
* Fixed: sub-directory issue with images
* Fixed: more examples to deal with CSS-inline, cloud storage, etc.
* Fixed: more examples in PHP
* Fixed: Thunderbird compatibility issues
* Fixed: improved custom widget API
* Fixed: improved filemanager loading performance
* Fixed: detect 'root' parameter automatically in sample scripts (update)
* Fixed: more widgets and options
