v1.8.9 - Arch linux release

What's Changed

• Move apt to pacman
• Move casper | live-boot to mkinitcpio-live-boot
• Move initramfs-tools to mkinitcpio
• Add support for overlayfs, replacing unionfs

Full Changelog: 1.8.5...1.8.9

Prebuilt binaries are available at Yuunix AUR