Feature request : export complete database with pictures

[spfmoby]

It could be useful to have a way to export all the data stored (think RGPD compliancy for example). That means:

• each list as a CSV
• The complete gear room list (CSV too)
• all the pictures, probably named by the id in the gear room list (or even better something like "ID_name_of_the_equipment.jpg")
  Everything packed in a zip file for example.

So if we want to self host our own lighterpack or keep a backup in case the service disappears (lighterpack and also the image hosting provider) we have a backup.