I don't usually like doing this and would prefer to just delete unused
code, but I don't have the context required to understand why this code
is unused. A refresh of this crate is on the (distant) horizon, so I'll
just leave these here for now to squash the warnings.
The top-level listing was just getting a bit too long for my taste. So
put all of the code in one directory and shrink the large top-level mess
to a small top-level mess.
NOTE: This commit only contains renames. The subsequent commit will
actually make ripgrep build again. We do it this way with the naive hope
that this will make it easier for git history to track the renames.
Sigh.
