Allow SFTP support to be enabled/configured in SCFG->Servers and
SBBSCTRL->Terminal->Configure.

SFTP session inactivity applies to 'H' exempt users too (intentionally).

And use it in the open() args log.

This explains the extra calls to record_transfer() on Windows SFTP server

I do wonder if we should be usign sopen() or nopen() here instead though.

This makes the Terminal Server settings menu a bit less cluttered. And now
we can add more SSH settings (like SFTP, Any Auth).

Q for Deuce: record_transfer() is being called multiple times for non-filebase
file transfers, resulting in duplicate log messages. This doesn't happen for
filebase file transfer (downloads, anyway).

For SFTP sessions, there's no shell/terminal, so no need to run command
shells (with their input timeouts, etc.). Reflect the node connection as
"via sftp" in the node status. Handle node interruption signal. Probably more
to do here with node status/actions (e.g. it'd be nice to set the action to
"uploading or "downloading" when appropriate).

These functions take a uint32_t, not a time32_t (which is an int32_t).

Every SFTP login/off would reset the user's new-file-scan date to Jan-1-1970

To support the full 32-bit range for things like dates/times, and message
numbers (!).

This should fix issue #732

Though dates beyond Feb 7 2106 are definitely going to still be an issue. I'll
definitley look into solving that by the the 2100.

See sbbs_t::logon() for example

Note: the client.protocol is still "SSH" here (not "SFTP"). Perhaps that
should be changed?

Does any client actually support simultaneous "SSH" and "SFTP" sessions over
the same socket?

Found by Coverity.

The array overrun crashed Win32, the asprintf() usage imacts glibc
and the other warnings are impossible (an exception would have been
thrown).

This includes the "OK" error, and numerous other normal errors,
so most of them are logged as LOG_DEBUG.

Also fail early if parsing underruns root.

This Win32 function behaves differently on Win32 than *nix, and
does not do what we want.

Instead, copy the important bits from xpdev, and resolve a TODO.

Oops, missed this with the cl32.dll commit.

I'm not clear on why MSBuild can build the solution without this but the IDE
cannot (results in sftp.lib not found, unresolved SFTP symbols, etc.).

<Deuce> Ok, Win32 will need a new cryptlib with these latest patches.

Deuceth commandeth, Robeth doeth

If a filename failed to be added for a readdir response, it would
have just skipped that file and continued with the files around it
rather than reporting an error.

DDLightbarMenu: When writing an item with UTF-8 text, check ANSI support before moving the cursor (and this is important if the menu is being used in non-lightbar mode)

See merge request !419

DDLightbarMenu: When writing an item with UTF-8 text, check ANSI support before moving the cursor (and this is important if the menu is being used in non-lightbar mode)

The /vfiles root uses the configured virtual paths as in the FTP
and web servers.  These paths should be shorter than the ones used
in /files, and also have the benefit of translating slashes so
users will not need to type a Big Solidus if they're trying to
type long lib or dir names.

This should speed up directory listings over higher latency links
by approximately 25×.

You're welcome nelgin.