[m-rev.] for post-commit review: prepare for LLDS string trie switches

[Peter Wang]

On Wed, 20 Mar 2024 02:15:49 +1100 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> The only part worth looking at is the change to string_encoding.m.
> The rest is just code being moved.
> 
> Zoltan.

That's fine.

Peter