Add official support for running as a service

[Hamy]

Hi In my opinion the only reason that a lot of users (including me) cant really get virtualbox to work as they want is because of lack of running VB as a service( the very same thing that Virtual Server for microsoft has ). we really need to be able to run VMs before logging in and shutting them down automatically when the system is shutting down. of course they are some tricks around already but they are all really messy and have a lot of issues. i think adding this ability could make a lot of users happy and make the virtual box the best virtualization software ever.

[B.Sam]

I also second that. even though the ticket is old, but it's still relevant. and it would be indeed great to have this ability