[TASK] Release of version 4.1.3, Disallow pagination pages greater than the maximum allowed number of possible pages

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

[TASK] Change layout of application form
[TASK] Rename variables

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