Send status information to standard error.
Later status output will be treated specially by the shell. It will have suitable representation in the UI.
Use status() when it's semantically a status - a task that's being done.
Send status information to standard error. Works only if stderr is a tty.
Consequtive status() calls will use tty escape codes to overwrite
previous status() message (one line up, erase to end of line, write new message).
Show status on a tty