Progress: Begin implementing controlfile and initfile support.

Progress: Begin implementing controlfile and initfile support.

The specifications are now implemented.
Provide examples of the  `controlfile` and the `initfile`.

Comments some TODO's that I am thinking about and will set aside for future consideration.
These TODO's will be removed once I wrap up the `controlfile` support regardless of whether or not I implement the TODOs.

The `controller` and `init` programs have the basic file support setup, but no function to actually process these are implemented yet.

My goal is to pre-process these files and then pass them along to the normal load functions.
Ideally, the file should need only be loaded in memory once.

I broke out some of the `controller_process()` functionality into another functions `controller_process_prepare()` and `controller_process_run()` for organizational purposes.

There are potentially some stale TODO/`@todo` comments that will be addressed and removed as I complete this functionality.