Add fields to the Download file : PromoCode used, Buyer (not attendee) name and email

**Is your feature request related to a problem? Please describe.**
For our internal processes we need that promocode , buyer name and email are also included in the download file.
Promocode : because that can give us the info if the ticket is one of the Free tickets included in sponsorship or it's a ticket paid by invoice and transfer in the future.
Buyer name and email : to contact them when there are tickets without name or with wrong data. We can see that at a glance in the excel file.

**Describe the solution you'd like**
Add those fields in the selection when downloading the file.

**Describe alternatives you've considered**
none

**Additional context**
none