The terminal title output should go to the same place as the rest of the
terminal output. It's important _not_ to send it to stdout, where it
would get included with the main program output when redirected to a
file - for instance with the rclone cat command.
golang.org/x/crypto/ssh/terminal is deprecated in favor of
golang.org/x/term, see https://pkg.go.dev/golang.org/x/crypto/ssh/terminal
The latter also supports ReadPassword on solaris, so enable the
respective functionality in fs/config for solaris as well.
Adds a flag, --progress-terminal-title, that when used with --progress,
will print the string `ETA: %s` to the terminal title.
This also adds WriteTerminalTitle to lib/terminal
