* migrate all scala generators to use oas3
* add back pom.xml for scala-sttp
* skip form model in scalaz
* fix scala lagom tests
* add new files
* skip form models in scala finch petstore
* update samples
* [scala-akka-http-server] When expecting an empty response, a response with an empty text/plain content is not produced anymore
* Updated scala-akka-http-server samples
Co-authored-by: Olivier Leonard <oleonard@ankama.com>