* refactor(os_input_output): use Pid for child process
* fix(debug): change debug_to_file to write &[u8]
This patch changes debug_to_file to write entire slices in one call, to
avoid the overhead of opening and closing files for each byte written.
* refactor(ServerOsApi): remove unnecessary muts from methods
Co-authored-by: KOVACS Tamas <ktamas@fastmail.fm>
* The setup subcommand was exiting the programm no matter what
even if the `clean` flag was provided.
Now it returns to the
main function on encountering the clean flag.
