Migration to version 16.0

[sbidoul]

Todo

https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-16.0

Modules to migrate

• [x] event_contact - By @edlopen - #368
• [x] event_mail - By @stefan-tecnativa - #316
• [x] event_project - By @Shide - #379
• [ ] event_registration_mail_compose
• [x] event_registration_multi_qty - By @stefan-tecnativa - #318
• [x] event_registration_partner_unique - By @carolinafernandez-tecnativa - #343
• [x] event_registration_qr_code - By @tansadio - #367
• [x] event_sale_registration_multi_qty - By @stefan-tecnativa - #319
• [x] event_sale_session - By @stefan-tecnativa - #333
• [x] event_session - By @stefan-tecnativa - #325
• [x] event_session_registration_multi_qty - By @stefan-tecnativa - #332
• [x] partner_event - By @carolinafernandez-tecnativa - #345
• [x] website_event_contact - By @Shide - #406
• [x] website_event_questions_by_ticket - By @carolinafernandez-tecnativa - #344
• [x] website_event_require_login - By @kwoychesko - #323
• [x] website_event_sale_cart_quantity_readonly - By @dsolanki-initos - #311

Missing module? Check https://github.com/OCA/maintainer-tools/wiki/%5BFAQ%5D-Missing-modules-in-migration-issue-list

[kwoychesko]

partner_event from 15.0: #322

[kwoychesko]

website_event_require_login from 15.0: #323