Consider changing default stop signal

[pvolok]

Currently default stop signal is SIGTERM on Unix and TerminateProcess on Windows.

On Windows, we should use some softer way that will allow proper termination. Perhaps sending 0x03 (Ctrl-C in ASCII) char?

On Unix some programs don't react to SIGTERM. For example, remix dev doesn't react to SIGTERM. On the other hand, nvim (and maybe zsh) will not stop if 0x03 char is sent to stdin.