This may be the first time in my life that I've used difftime()...
which is strictly one of only two things you're actually allowed
to do with a time_t per the C standard (the other is convert into
a broken-down time).

This reverts commit 9b2c9c08.

Don't need this now that we use the property sheet method

This is the (better) way. See, Deuce knows the coolness of property sheets!

To get proper high DPI scaling and such

This reverts commit cb710acf.

This is not the way.

When passed values between (-1 and -59), this function would output something
nonsensical like: "UTC0:01" or "UTC0:59". Now we'll make sure there's a minus
sign in these conditions (e.g. "UTC-0:01" and "UTC-0:59").

This isn't doing what I want, but maybe Deuce can help look at the artifact
from the build pipeline and offer suggestions.

Also, change the shell order a little

If the timezone is set to automatic and it's not a new install, don't display
"UTC0:01" as the time zone (that's weird), display "Automatic (UTC[+/-]HH:MM)"
instead.

When changing the system password via this config wizard, the cryptlib.key
and ssl.cert files, if they exist, will be invalid, so delete them.

See issue #854 for details

Most of these shells (their menu/display files really) require a terminal at
least 80 columns wide to look/work right.

warning C4244: 'return': conversion from 'uint64_t' to 'unsigned int',
possible loss of data

... especially when it's already beeen installed

This'll keep your ip.can and spamblock.cfg files maintained.

This is that rare case where a Coverity fix makes the code more
obvious and shorter.

This ones does require SSIZE_MAX... so let's see what the pipes say...

These are either correct and trivial to fix, or false positives,
but fixing is easy enough that it's not a problem.

While it's only been around for about 18 years, I'll assume that
anyone updating the exec directory has updated Synchronet as well.

(user_t.misc, User.settings), when enabling auto-terminal detection. This is
similar to what we do in logon.cpp already:

	useron.misc |= (AUTOTERM | autoterm);

We used to have this logic in useredit.cpp, but was removed in commit
8a71ab16, probably due to editing offline users (e.g. in ;uedit sysop
comand). So just do the copy of autoterm flags when editing the *current*
(online) user. This likely addresses the original concern in that commit.

And it fixes issue #853, thanks to Deuce for root-causing

... since that puts us back into VGA tall-font mode

Each app can have its own config file as well (e.g. ctrl/scfg.ini)

We're just converting/upgrading this file (to time.ini), so don't log an error
(reading) if/when the file doesn't exist.

Fixes Error: Unresolved external 'GetNetworkParams' referenced

Some things were using the global i and not a local i... this was
not a problem.

Added alerts when lightbar.draw() aborts due to no ANSI or no colour.

Fixes JPEG XL again.

... or at least, try really hard not to