- require ARCH/RELEASE for rootfs cli
- disallow BOARD/LINUXFAMILY/BOARDFAMILY being set for rootfs cli
- split `prep_conf_main_only_rootfs()` instead of `prep_conf_main_build_single()` for rootfs-only stuff
- run both conf and build without stdin for rootfs CLI (no interactive allowed)
- don't blindly set `ARCH=armhf` for no reason in main-config
- allow skipping family stuff in main-config, via `allow_no_family=yes` (used only in `prep_conf_main_only_rootfs()`)
- kill double loading of userpatches family, not needed/old code
- allow skipping kernel stuff via `skip_kernel=yes` in `config_pre_main()` (used only in `prep_conf_main_only_rootfs()`)
- make `tmpfs_estimated_size` and `available_physical_memory_mib` readonly and global and only ever set once
- remove subshell from `get_rootfs_cache_list()`, new version `get_rootfs_cache_list_into_array_variable()` for sanity
- warns if `ROOT_FS_CREATE_ONLY=yes` is set during cached build path
- add a `wait_for_disk_sync()` after restoring rootfs cache
- fix logging sections for `build_rootfs_only()` and `prepare_rootfs_build_params_and_trap()` in `build_rootfs_and_image()`
- remove the logging section from `get_or_create_rootfs_cache_chroot_sdcard()` call in `build_rootfs_only()` (which is now itself logged)
- @TODO: `deploy_qemu_binary_to_chroot()` is leaking a qemu bin in rootfs cache!
- _told ya it would all make sense eventually..._
- introduce new, real, non-alias `rootfs` command in `cli-rootfs` -- this _only_ builds rootfs, nothing else
- no more `main_default_build_single()`; instead `full_build_packages_rootfs_and_image()`
- introduce `do_with_default_build()` wrapper, for things that need host prepared + aggregation to run
- CLI-specific parts of `main_default_build_single()` moved to cli-build
- put prepare/cleanup pair of `prepare_rootfs_build_params_and_trap()` and `trap_handler_cleanup_rootfs_and_image()` into new `trap-rootfs.sh` (this needs further splitting for the image part)
- refactor `get_or_create_rootfs_cache_chroot_sdcard()` into `build_rootfs_only()`, `calculate_rootfs_cache_id()`
- update library with new files
