* Refactor webhook payload convertion

* Fix lint

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Start webhook refactoring to reduce code duplication

* More webhook refactoring

* Unify webhook release messages

* Fix webhook release link

* Remove sql import

* More webhook refactoring

* More webhook refactoring

* Webhook tests extended

* Fixed issue opened webhook

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <matti@mdranta.net>