[SWIFT] Bug Generating Code From JSON With Namespaces

Description

In the swagger API documentation all the models have their namespaces prefixed (comes from C# project), for example if the model name is Model, then the full name will be something like Project.Namespace.Something.Model

When generating using swagger-codegen, to Swift or Kotlin (haven't tried anything else), the class names and their file name get generated as ProjectNamespaceSomethingModel instead of just Model

We tried to fix this behavior by replacing the dots in the names with forward slashes, so the full names become Project/Namespace/Something/Model in the JSON, but it only solved the issue when generating Kotlin (the file/class names are ok, everything is generated into their respective folders), but Swift generation still shows the same behaviour (all the models residing in the same folder SwaggerClient/Classes/Swaggers/Models/)

Is this intended behavior or indeed a bug?

Swagger-codegen version

swagger-codegen: stable 2.3.1

Swagger declaration file content or url

Gist: https://gist.github.com/VBasinovas/4bcfe613ab97aca11bfb0a5c023c8fe1

Command line used for generation

swagger-codegen generate -i documentation.json -l swift -o ./api-code/swift
swagger-codegen generate -i documentation.json -l kotlin -o ./api-code/kotlin

Steps to reproduce

Just generating the code from provided json with provided command line produces the issue described

Related issues/PRs

Suggest a fix/enhancement

Start with the provided documentation.json or gist and run the Swift and Kotlin generation commands from the issue. Compare the generated model names, class names, and directories, then trace the relevant language-generator behavior. Done means Swift handles namespaced models consistently with the expected Model names and appropriate output layout.