Smart Cleanup Tools - Plugin for WordPress 5.3

* New: tested with WordPress 6.2, 6.3 and 6.4
* New: tested with PHP 8.3
* Updated: minimal requirement: WordPress 5.8
* Updated: minimal requirement: PHP 7.4
* Updated: few minor updates and changes
* Updated: various modifications to the core code presentation

Fixed: issue with the main dashboard panel loading