- Fixed grub mbrid file search
  To identify the root device for ISO images (live and install media)
  that boots via grub2, kiwi uses a grub2 --file search. The searched
  file was named /boot/mbrid, however this is not a unique name and
  could be found on other devices of the system as well. To connect
  the search to the correct media this commit changes the search to
  an ID based method which is unique to the image build process.
  This Fixes #2389

- Don't use kernel-install
  kernel-install does a lot more then making the kernel available
  to the ESP. It calls dracut, it creates loader entries and all
  that is unexpected and also breaks the boot because the way
  dracut is called in the image build case where host != target
  leads to broken results. This commit refactors the systemd-boot
  support in kiwi to prevent the use of kernel-install

- Add check_efi_fat_image_has_correct_size
  Add runtime check for to check that the efifatimagesize
  does not exceed the max El Torito load size

- Add support for ISO boot via systemd-boot
  Create proper EFI FAT image via bootctl to be used as
  alt loader in xorriso. This allows to boot the ISO
  via EFI e.g kvm -bios /usr/share/qemu/ovmf-x86_64.bin -cdrom file.iso
  Please note, hybrid boot is done via grub's hybrid MBR and
  as systemd-boot does not provide one, hybrid boot is out
  of scope yet. This Fixes #2281

- Support TOML markup

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