Update: redesign console processing code

Update: redesign console processing code

Simplify the console structure and reduce the size of codes and parameters.

The "extra" parameter seems a bit overkill, remove it and help keep this project more along the lines of the idea of "Featureless".

Rewrite and document fl_process_parameters().

Implementing functions were only functionally updated.
Additional changes are likely necessary for the logic, such as supporting multiple calls like "program -h +n +l", which by order of operation the final "+l" should override the "+n".