File Manager

- support for setting hotkeys
- support for driver variables, not just boot variables.
- support for arbitrary device paths with -c (including guid parsing)
- maintain a list of known GUIDs and print {vendor} instead of the full GUID
  - accept these for arbitrary paths as well.
  - these are done in libefivar, but efibootmgr still needs some work on it
- MS-DOS style extended partitions
- lots more network stuff
  - IPv6 with various discovery methods
  - IPv4 w/o dhcp
  - make sure FCoE works
  - iscsi
- make sure nvme works