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Draft: Added Liveid support

adrian15sgd requested to merge adrian15sgd-guest/live-build:add_liveid_support into master

This creates an unique UUID for the media. Its saved thanks to some directories and files into the media filesystem.

E.g.: /LIVEID/5BAA1131/19EB89E1/DF6EDB7E/6F422B5C is created in the cdrom.

Also linux cmdline will have liveid=/LIVEID/5BAA1131/19EB89E1/DF6EDB7E/6F422B5C so that live-boot knows exactly which device is the right one for the kernel+initrd which have been loaded onto memory.

This avoids problems when you have 4 usb pendrives connected to your computer and you select one of them to boot from your BIOS/UEFI firmware. In many cases this will trigger a different usb pendrive to be used instead.

Also avoids problems with some HP laptops that have pre-installed live-build systems on their first partition.

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