* util-iso: try to fix uefi usb boot

* util-iso-*: put grub-theme in livefs

* util-iso-boot: reduce efi.img size

* util-iso: readd xorriso args

* util-iso: fox mod_date length

* util-iso: don't create mod_dte file for now

* [util-iso] try to fix issue with efi.img

* util-iso-boot: remove grub video dir

* util-iso: clean up assemble_iso()

* doc: remove obsolete entry from deployiso
util-yaml: formating fix

* util-iso: set the grub theme by $iso_name