fixed related module check for {mail} in view.php
no duplicated slice id
fixed error when module is not found
fixed filterform in item manager
PHP-JWT updated to 7.*
When 404 custom page is set, it is no longer sent when browser does not accept text content (so request to non-existing apple-touch-icon-precomposed.png do not generate err page, but just empty 404). Should fix Avast false positive security warning.
improved url parsing for older sites where Languages are not specified - /bflmpsvz if considered 404 instead of xlang=bf xflag=lmpsvz and xseo1=home
use "never" return type, where possible