Sleep option, instead of power down

[mrsilver76]

It should be easy to configure the script to sleep instead of shutdown.

For Windows, rundll32.exe powrprof.dll,SetSuspendState Sleep may need to be used (even though it's not usually recommended). This is because any other solution will require downloading a seperate program.

For Linux, systemctl suspend should work.

[mrsilver76]

For Linux, look at rtcwake instead of systemctl suspend.

Need to remember that using server uptime cannot be reliably used any more (since the server hasn't been rebooted) - so the date and time needs to be stored somewhere.