https://gitlab.synchro.net/main/sbbs/-/commit/3a5e9cb3628031f8812840c5
Modified Files:
docs/v322_new.md src/sbbs3/scfg/scfg.c scfg.h scfgmsg.c
Log Message:
Restore SCFG import/export of subs.txt, alongside subs.ini

subs.txt import/export was removed in mayor-19-caps (e6acb3269a) and its
menu slots later repurposed for *subs.ini in reef-31-feed (cfb32e03f5).
Some sysops still rely on the legacy text format (especially for import),
so this restores it as an additional format while keeping *subs.ini as
the preferred format going forward.

Message Areas > Export/Import Areas list subs.txt again, the -import=
command line recognizes a subs.txt filename once more, and the
line-oriented parser/writer are back.

Rather than the old memcpy-over-the-existing-sub (which zeroed every
field the format doesn't carry - qwk_conf, print modes, area_tag, ...),
the import now copies only the fields subs.txt actually provides, leaving
the rest of an over-written sub intact. ptridx is likewise preserved
(the exported value is meaningless on the importing system).

Partially addresses issue #1128.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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