* Added support for 'additionalProperties:true' to scala-cask generator
additionalProperties means the request can contain arbitrary
additional properties, and so this change adds an 'additionalProperties'
field to request objects which is a json type.
* fixed warning in example scala-cli project
* updated samples
* addressed codegen comments
* moved service api into shared source
* moved service api into shared source
* This Scala cask change makes the service traits available to
Both JVM and JS platforms.
It does this by moving the api interfaces into the cross-platform
Shared sources
