* 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
* stripped parameter enabled for all scala based generators
* scala samples updated
* docs generators updated
* fix scalatra. regenerated by openapi3 script.
manually removed enum default value from scalatra example due bug in schema extraction