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>
* Allow to import orders
* seats, subevents
* Plugin support
* Add docs
* Warn about lack of quota handling
* Control interface test
* Test skeleton
* First tests for the impotr columns
* Add tests for all columns
* Fix question validation
* Custom HTML email renderers
* Move inline_css call
* Small fixes
* New HTML mail style for pretix
* Thumbs
* Inlinestyle for notifications
* Documentation
* Set line-height
* Add data shredders for PII
* First working shredder
* Add more shredders
* Add new shredders and download confirmation
* tmp
* PayPal, Stripe, banktransfer
* Add icon to logs
* Untested payment log shredders
* Add waiting list shredder
* First tests
* Add tests for shredders
* Improve templats, link to shredder
* Test payment info shredders
* More tests
* Documentation
* Fix enabled flag in payment provider overview
* Fix minor issues