Add a local state

Having a local ~/.state file will allow virtual machines to be restarted or provide the capability to ensure that we can removed persistent storage once the VM has been shutdown.

Ideally the state will be an array of the VMs:

```
{ 
VM : "1234",
DISK: "/path/to/disk",
CMD: "qemu-x86-64 -blah -blah",
etc...
```