[ISOHYBRID]

[ISOHYBRID]
Import the isohybrid tool from http://repo.or.cz/syslinux.git/tree/138e850fab106b5235178848b3e0d33e25f4d3a2:/utils

I had to add a lot of glue code (getopt, err/errx/warn/warnx) to get it to compile under all our build platforms Windows, Linux and macOS.
GPT/Mac partition support is disabled at the moment (look for REACTOS_ISOHYBRID_EFI_MAC_SUPPORT), that would need a portable libuuid.
A fix for correctly opening ISOs as binary and not text-mode has been implemented and already sent upstream.

ISOs are not being patched automatically yet due to CORE-12692

CORE-12648

svn path=/trunk/; revision=73595