[RFC] add minimal set of xtools to live images
~~depends on: void-linux/void-packages#37826~~ see also: void-linux/void-docs#688
This will allow for easier chroot installs by way of xchroot and other xtools
tested a local install, and ensured that it does not include the package (previously named xtools-live, now named xtools-minimal) in the installed system:

This addition does not change the total size of the live image at all, because the xtools-live package is only ~25 KB and all dependencies are already in base-system
after this is merged and new live images are generated, the chroot install documentation can be updated to use xchroot
~~Hmm, this will also install the package when the Local source is used, I am not sure if we want that.~~ I just saw the part of this PR that explicitly removes it