https://trello.com/c/PtW89d14/3338-extsgmail-restore-used-filters-after-going-back-eg-inside-the-mail-queue-store-them-inside-a-php-session-also-check-all-other-ba

[FEATURE] Introduce the path_segment field that allows to give proper URLs yourself, Also a lot of cleanup was done

To prevent users from clicking the "Create New" button on the index
page of the backend module, we make this button admin only

[TASK] Fixing a backend module bug that prevented the filter from showing when there are no search results