2022.05: SkiffOS Mainline Release

This mainline and LTS release corresponds to Buildroot 2022.05.

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Changes since SkiffOS 2022.02.1:

• Buildroot: see release notes
• Update linux to 5.17.3
• Update rpi to 5.15.44
• Update odroid to tb-5.18.1
• Switch default skiff/core to lightweight Debian XFCE from Snap-based Ubuntu.
• Add core/ubuntu and core/debian.
• Update core/gentoo significantly.
• Add support for Busybox configuration fragments.
• Add examples to README for wifi & ssh config.
• Improved support for skiff-init-squashfs on devices with very low RAM capacity.
• Added skiff-init-kexec experimental boot method.
• Fixed issues resizing the persist filesystem with skiff-init-squashfs.
• Pine64: completely switch to skiff-init-squashfs based boot.
• Fix an issue compiling the virt/wsl target.

New devices added:

• allwinner/nezha: Allwinner D1 Risc-V CPU in a Pi form factor.
• allwinner/licheerv: Allwinner D1 Risc-V CPU in a tiny form factor.
• beaglebone/ai: BeagleBone AI by BeagleBoard.
• beaglebone/black: BeagleBone Black by BeagleBoard.
• beaglebone/x15: BeagleBoard X15.
• freescale/wandboard: The FreeScale wandboard legacy device.
• odroid/hc4: The odroid HC4 "toaster" dual-SSD/HDD form factor device.
• odroid/m1: The odroid M1 by Hardkernel.
• pine64/book_a64: The old legacy Pinebook A64 1080p model by Pine64.