v48

* use default reflector service
* prevent overwriting existing files with skeletons (FS#67729)
* use mtools instead of mounting a FAT filesystem
* use default initramfs name(s) and allow multiple kernels
* unify paths in use in iso9660 and FAT
* modularize syslinux configuration (per kernel)
* generically calculate size required for efiboot.img
* fix info output for legacy commands
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