Features:
+* sd-boot: we probably should include all BootXY EFI variable defined boot
+ entries in our menu, and then suppress ourselves. Benefit: instant
+ compatibility with all other OSes which register things there, in particular
+ on other disks. Always boot into them via NextBoot EFI variable, to not
+ affect PCR values.
+
* in sd-boot: load EFI drivers from a new PE section. That way, one can have a
"supercharged" sd-boot binary, that could carry ext4 drivers built-in.