Update cf_gen objects to use STL containers and extend syntax for DEFAULT*

Update cf_gen objects to use STL containers and extend syntax for DEFAULT*

Removes all need for explicit memory management of the parsed tree.

Alters DEFAULT: tag to allow multiple line values to be pre-defined.

Adds DEFAULT_DOC: tag to allow text description of a default in the documented
versions of config file instead of explicit code-level values.

Also updates the output slightly so cf_parser.cci conforms to the current
coding style gidelines.