Aligning Server and Radio Main classes. Adding error handling to Radio.
Further aligning Radio and Server Code. Introducing ActivityWriter intf.

Radio is using a null activity writer which is doing nothing.
Licensing some new licenses.
Removing usage of implementation class in NodeServiceImpl.
Removing usage of input implementation class.
Preventing jackson from serializing raw fields of persisted models.
Removing usage of implementation class in RadioResource.
Removing reference to implementation class.
Ignoring internal fields in JSON serialization.
Simplifying ClusterResource.