Refactor: Convert old f_file_t output strategy to the newer fl_print_t output strategy.

Refactor: Convert old f_file_t output strategy to the newer fl_print_t output strategy.

The "f_file_t output" should now be "fl_print_t output".
The output verbosity can now be used rather than the error verbosity for output verbosity.
This makes the code more readable and consistent.

The default fl_print_t_initialize is for normal output so also convert the error output initialization to use macro_fl_print_t_initialize_error().