UEFI boot support

[NHellFire]

I've pushed a branch with UEFI support.
This still supports legacy(BIOS) boot and the ISO can still be written directly to a flash drive.

Known issues:

• ISO written directly to flash drive won't boot in UEFI. Legacy does though.
• Boot menu needs finishing (only has interactive)

This will be merged into master once any issues are resolved.

Download: https://github.com/NHellFire/dban/releases/tag/nightly%2F20170718-gb9027694a

[dxgldotorg]

Will this support removing UEFI boot entries whose bootloaders have been destroyed by the disk erasure process?

[Firminator]

If I understand this question right those old boot references would need to be removed from within the UEFI Setup/Config GUI or the UEFI shell.

[dxgldotorg]

If I understand this question right those old boot references would need to be removed from within the UEFI Setup/Config GUI or the UEFI shell.

I do believe a process with root permissions in a UEFI-booted Linux can manage the boot table. If it is booted in BIOS, then it won't work.