Add new functionality and updated config.json with new parameters

[ddobrin]

1. ability to generate model only
2. ability to bypass the model regeneration
3. ability to generate code using arbitrary names for the generation config file, as well as the specification file

[ddobrin]

Add new functionality and updated config.json with a model generation only option; it is an optional flag default to false

[DSchrupert]

Hi @ddobrin , was there an associated change to the documentation to help with discovery of this new feature?

[ddobrin]

Hi @NicholasAzar : there will be an update to the documentation.

There were 2 showstoppers which had to be addressed first and have been committed last night and today.

Documentation will follow for the config.json