Write a full parser for the ARM64 EFI/PE stub header

[marin-m]

See issue #67 and others

See the output of readpe: https://github.com/mentebinaria/readpe

See: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kernel/efi-header.S?id=v5.13