Implement ReadConsoleForTermEmul for Windows?

[lonnywong]

https://github.com/PowerShell/openssh-portable/blob/latestw_all/contrib/win32/win32compat/tncon.c

Make ReadConsoleForTermEmul act as os.Stdin, e.g., https://github.com/chzyer/readline/blob/master/rawreader_windows.go

[lonnywong]

And make queue_terminal_window_change_event() as a go callback?

[lonnywong]

The ReadConsoleForTermEmul supports Ctrl+Space. Check PowerShell/openssh-portable#569 .