session auto-save on low battery

[wsourdeau]

On OSX, after the OS notifies applications that the battery power is low (around 10mins left), the VM sessions are automatically saved and shutdown. There does not seem to be a configuration option regarding that feature. Although I can see how this feature can be useful, I find its automatic behaviour intrusive, since there is no way for the active user to prevent that operation from happening, thereby losing control of its sessions, no matter what work (s)he is currently doing.

I think this should be configurable, by vm or for virtualbox in its entirety, in order to either not perform those shutdowns or either ask the user whether it should occur or not.