Loading ipxe.efi with a custom script

[NiKiZe]

The efi version should probably take a script in the same way as legacy but might not be as easy. ipxe should also take cmdline parameters and run them as a script so something like ipxe.efi echo Im Alive should show that message and then exit, maybe not a so useful version, but then there is the file:// uri extension in ipxe.efi
so together you might be able to do something like ipxe.efi chain file://script.ipxe
Don't know if you need to initrd script.ipxe to have it loaded or not tho.