Add a security warning to the debug console's default output.
Add a security warning to the debug console's default output.

This adds a generic warning message to the debug console's initial
output, mentioning that the commands available should not be used
without prior understanding of what they do.

Also fixes the `clear` key combo displayed when on macOS.

Signed-off-by: cevap <34c6fceca75e456f25e7e99531e2425c6c1de443@i2pmail.org>

ionomy/ion,cevap/ion,ionomy/ion,cevap/ion,ionomy/ion,ionomy/ion,ionomy/ion,cevap/ion,ionomy/ion,cevap/ion,cevap/ion,cevap/ion