Option to ACPI poweroff on Windows Shutdown

[utkarshsins]

Feature request :

Allow an option to send an ACPI shutdown signal when Windows shuts down, and automatically start the VM when Windows starts.

I need this feature because the Virtualbox NAT breaks when VM resumes on VBoxHeadlessTray when my Windows restarts. I can afford just shutting down my VM, and restarting it when my Windows restarts, I don't have to save the state.

You can keep the previous option as default (save state and resume on restart), and provide this as a secondary option.