xF2 Add-on [BR] Support Ticket System 3.2.1

### Fixed
- Call to undefined method: getBreadcrumbs
- Template error: Template public:mjst_alert_support_ticket_new_ticket
- Template error: Method isFirstPost is not callable

### Added
- Email piping feature.
### Fixed
- XSS vulnerability.
- Predefined reply.
- Minor bug fixes.