Added OptionCode 93 for Client Architecture
Added OptionCode 93 for Client Architecture

Determine which of [BIOS, 32-bit EFI, 64-bit EFI] the client is, if provided by the client.  Used for determining whether to serve up legacy, 32-bit EFI, or 64-bit EFI boot images for PXE.  Value expected is 0, 6, or 9 (= legacy, 32, 64).
albertjin/dhcp4,yourkarma/dhcp4,krolaw/dhcp4