e.g. [can|is]_subject_something() is now named subject_[can|is]_something()

No functional change.

temp_cmd() should've been called first on any sane platform. <shrug>

Previously, we actually moved one more line back than we had to.
This only moves lines back that need to remain where they were.

This shaves another couple seconds off the benchmark.

The code was moving unscrolled lines back after scrolling the
majority of them... if all lines were scrolled, moving some back
actually broke scrolling.

Thanks Coverity!

Borland doesn't need this, and making the new feature work with it
would be immensely painful, so just disable the files in Borland.

Also, now the JS format()/printf()/etc. can use field specifiers.

Just in case xp_asprintf() is used for text.dat strings.
The field specifier allows you to change the order of parameters,
which is useful for translating (and useless for anything else).

There must not be any "skipped" parameters though, you must use
all of them between the first one and the last one you use.

... so just hitting ENTER will stick with the current mouse enablement.

They weren't standardized until 1999, why would Microsoft support
them?

like datestr() does.

Completely remove the 80 column screen width assumption/limit.

This makes the performance about seven times better.  Previously,
outputting the entire works of Shakespeare took about two minutes,
nineteen seconds on my system.  With this change, it takes about
19 seconds.

This is still far behind non-BBS terminals like XTerm and Alacritty
which tend to do that job in under one second.

The main improvements:
- For the bitmaps in memory, make them a ring buffer, and for
  full-width scrolling of more than half the screen, just move the
  top instead of a memmove()
- Eliminate unnecessary comparisons and calculations in the glyph
  rendering loop
- Combine drawing glyphs beside each other for better cache usage

This still needs some cleanup, and much testing.

result in segfault (e.g. adding long filenames using fileman.js)

Eliminate use of strcpy() and sprintf() in this file

... and download events.

The "Native Program List" was a hack left over from the transition from
MS-DOS to OS/2 and now with extensible configuration files, like we have now,
there's no reason not to add more fields and make it easier to specify which
of these programs (most/all of them nowadays) are actually native to the
host OS.

The defaults (e.g. when creating a new file type) are unchanged for now.

Shorten the native_opt from "Native Executable/Script" to just
"Native Executable" to make it usable in opt lists with narrower option name
columns.

... sometimes the generated command-line is different depenending on the
external() mode flags (e.g. EX_NATIVE).

No need to load/modify messages that already have DELETE attribute flag set

Log a debug-level message after loading messages upon POP3 login.

Optimization:
No need to read and re-write headers that already have the DELETE attribute.

Fix:
Forced permanent removal of deleted messages (e.g. when creating a new user
that's reusing an existing user number), didn't work unless SCFG->Message
Options->Purge Delete E-mail was set to "Immediately" (not the default).

slyedcfg.js bug fix: Now successfully saves settings if SlyEdit.cfg is nonexistent (not in sbbs/ctrl or sbbs/mods)

See merge request !490

slyedcfg.js bug fix: Now successfully saves settings if SlyEdit.cfg is nonexistent (not in sbbs/ctrl or sbbs/mods)

We don't want our assertions asserting.

Previous commit capped it too early.

The lock is recursive.

Add/use new print mode flag: P_ATCODES for use with trusted format params

Renamed text.dat strings (to better support translation/localization):
- Deleted -> DeletedUser
- Inactive -> InactiveUser

New text.dat strings:
- Deleting
- DoneDeleting
- Deleted
- DeletedNumberItems
- E_Mail
- E_Mails