Hack up message list to be sorted ascendingwip/asc_sort_imap

By default aerc is designed to revert sorting of the message list in
descending order. It's some kind of yolo thing? Possibly an attempt to
cater to Outlook and Gmail users who never ever act on messages, but
merely read the latest arrivals and leave them in the INBOX.

There is a sort command as well as a sort config option, but they
silently do not work with imap. According to #aerc on Libera.chat it
should work with other email storage methods, but I haven't tried.

When aerc is fetching the list of messages, it is done by first sending
a 'UID THREAD REFERENCES "UTF-8" (ALL)' to the server, and then
proceeding to actually fetch messages in sane order. The reverse happens
later (in files modified by this commit).

Supposedly reversing of order with other backends are done once while
building the data structure, and is then reversed again when traversing
it.

One could have the idea of doing the same with imap, but that is an
impossible (or at least impractical) thought to consider, since the imap
grammar does not support combining threaded search and reversed sorting
if I understand [rfc5256s5][] correctly.

This patch merely fixes up aerc to be useful to me. Please approach me
on Libera.chat for discussing a proper fix. I'm known as |cos| there.

[rfc5256s5]: https://datatracker.ietf.org/doc/html/rfc5256#section-5

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