Select All Posts

Adds a checkbox to wordpress tables to allow bulk actions on ALL items in the table.

Tested on posts, pages, and woocommerce products.

To read about how it works:
https://codewithbanji.com/2020/04/10/how-to-insert-a-select-all-button-to-a-wordpress-table/

And for other coding issues:
https://codewithbanji.com