NVMe INT13h option ROM: boot legacy PCs from NVMe storage

This project allows old x86 computers using a classic BIOS to boot from modern NVMe storage attached via PCI(e). It's a heavily modified version of iPXE (which usually allows for booting from the network), but instead of the network, this code uses a port of the SeaBIOS NVMe implementation to talk to a local NVMe drive.

What a useful idea.