v1.9.13 Maintenance release for osTicket 1.9.x branch === Enhancements * Help topic can be specified by the ID number in the URL for client new ticket page (#2735) === Improvements * Fix crash requesting registration email as a guest, thanks @bailey86 (#2552) * Fix attachment filename encoding (#2586) * Fix bounce message loop for message alert to a bad agent email address (#2639) * Sort help topic names case insensitively (#2350) * Fix redactor toolbar appearing over the overlay (#2697) * Add help tip for primary role, thanks @colonelpopcorn (#2680) * Add icons to assigned-to column, thanks @antriver (#2695) * Upgrade to htmLawed 1.20 (#2935) * Fix stripping of `src` attribute in `iframe` elements (#2940) === Performance and Security * Reduce memory usage processing attachments, thanks @ericLemanissier (#2491,#2492) * Protect access to files shown in the FileUpload field (#2618) * Always perform validation server-side for ajax uploads (e3c9e0f) * Decode html entities before scrubbing (#2940)