forked from CGM_Public/pretix_original
* Add testmode-support-flag to SalesChannels * Make saleschannels/testmode-warnings even more dangerous! * Add warning for payment-methods that do support testmode but are being used in a non-testmode order caused by a saleschannel in a testmode-shop. * Remove redundant testmode_supported-flag for WebshopSalesChannel * Raise error on API when sales_channel does not support testmode * Tests * Fix style issue after merge