ADDED: Capture person who checked-in attendee on edit ticket and report pages
ADDED: New ticket subject variables. Added support for variables in ticket email
FIXED: Ticket import variation support
FIXED: Barcode generation when importing Tickets
FIXED: Various ticket importing bugs
FIXED: Unpaid tickets CSV export bug
FIXED: Follow-up emails category bug
FIXED: Various other small bugs
TESTED ON: WordPress 6.1.1 and WooCommerce 7.4.1