This was becoming heavy to manage.

This is the first commit I do entirely in VE. It's a habit I'm planning
on taking as it helps a lot to find usability issues.

Now that everything is cross-compiled, no need to XPACK. If we ever
need it again, we know where to find it.

And use them in all places they make sense.

Big bootstrapping change which greatly reduces the role of the modern
operating system in the bootstrapping process.