Add a registry for datasync providers and an associated sync queue, to be used by
plugins that transfer data from pretix orders to external systems.
Additionally, provide a generic data mapping interface to be used in settings pages
of such plugins, to let users configure which information from pretix to fill into
which data fields of the external system.
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Co-authored-by: Raphael Michel <michel@rami.io>
* Generalize import process from orders to more models
* Add voucher import
* Model import: Guess assignments of based on column headers
* Fix lock_seats being pointless
* Update docs
* Update doc/development/api/import.rst
Co-authored-by: Richard Schreiber <schreiber@rami.io>
* Update src/pretix/base/modelimport_vouchers.py
Co-authored-by: Richard Schreiber <schreiber@rami.io>
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Co-authored-by: Richard Schreiber <schreiber@rami.io>