* Upgrade Django to 3.0 and other dependencies to recent versions
* Fix otp version contsraint
* Remove six dependency
* Resolve some warnings
* Fix failing tests
* Update django-countries
* Resolve all RemovedInDjango31Warnings in test suite
* Run isort
* Fix import
* Update PostgreSQL version on travis
* Drop support for maindomain_urls/subdomain_urls in plugins
* Allow to use a custom domain per event
* Fix bug when manually saving domains
* Fix custom domains in debugging
* Fix middleware
* Fix middleware again, update docs
* Make next url authentication backend dependent
* Rename authentication next_url to get_next_url.
* Add test for custom authentication backend get_next_url.
* Fix typo in docstring of authentication backend get_next_url.
* Fix caching issues in SASS compilation
* Allow to set a custom page background color
* Allow to disable round corners
* Support larger header pictures
* Allow to show title despite header
* Move language picker
* FIx widget styles
* PoC for ItemMetaProperties/Values
* Missing is_valid
* ItemMetaProperties/Values in editable via API, cloneable
* Tests
* Add Docs
* Fix import order
* Fix another import sorting...
* Typeahead for ItemMetaValues
* Test for editing event-objects
* Fix typeahead permission checks
* Further access restriction
Co-authored-by: Raphael Michel <mail@raphaelmichel.de>
* Send signal when orderposition is checked in
* Add position_checked_in signal to documentation
* Rename signal to checkin_created
* Update general.rst
* Update signals.py
Co-authored-by: Raphael Michel <mail@raphaelmichel.de>
* Data model changes
* Fix test failures
* Adjustments
* Some tests and API support
* Check when extending orders
* Make things more deterministic, fix style
* Do not apply negative discounts
* Update price_before_voucher on item/subevent changes
* Add tests for price_before_voucher in combination with free price
* Fix InvoiceAddress.DoesNotExist