Auto Pause VM when session will expire

[FreGitHu]

I think the VM should become paused when the UTM session is about to expire. Here's my reason.

Today, I was installing Windows XP on my iPad when I left it for a bit. It locked, it gave me the notification that the session will expire, but I missed it and now I have to wait another 40 minutes.

This probably will be an easy feature as the notification is already displayed so you probably could also auto-pause the VM incase iOS kills it.

[osy]

We support the following cases for auto-saving. We cannot auto-save right before the OS kills the background app because the OS gives a very short time for the app to terminate and if the save takes too long, it will kill the app and corrupt the VM.