Admin Columns Pro 6.4.8

* [Hotfix] The ReadOnly class is renamed because it gave a fatal error in PHP 8.1

* [Added] New hook `acp/sorting/custom_field/numeric_type` to change the datatype for numeric custom field sorting
* [Improved] Better sticky header solution to prevent third-party plugin styling conflicts that causes header offsets
* [Fixed] Fatal error that could happen on the WPML String translation page
* [Fixed] Disabled the editing setting for unsupported Custom Field field types
* [Updated] Admin Columns Core changes ( 4.4.4 )
* [Improved] UI Improvements

* [Added] When creating a new column set, you can now choose to copy the settings or start with the default columns
* [Fixed] Activation button was not always enabled when entering the license
* [Fixed] Colspan for Quick Edit and Bulk Edit (Quick Actions) is now correct when Sticky Headers is active
* [Fixed] Removing terms in Bulk Edit did not work correctly
* [Fixed] It was not possible to enter negative numbers in Editing for numeric custom fields
* [Updated] Admin Columns Core changes ( 4.4.3 )
* [Improved] The Menu Order column has no restrictions anymore