Broken with the paranoid_strtoul() addition

As much as possible, ENTER should mean "no change".

A sysop can do the same by going through the 'I' (user config/settings
command), but that's a bit more convoluted.

Since it's technically a "local post", but the user/sysop wants their client-
provided email address to appear in the header, use it, if provided (don't use
a made-up BBS email address that may not be valid).

For Accession

With this, you don't need a username, password, PSK, or PSK ID,
certs, CAs, etc, and things just work by magic (when using the
Synchronet broker)

For when running as a service.

As always when writing documentation, fix things that aren't quite
right... we now schedule nextPacket, but run each packet to
completion as long as we have all the bytes.

We don't need this anymore because the paranoid wrapper does it.

This is kind of a prototype for xpdev... but it's a bit klunky.

The issue these fix is that some C libraries (Windows and GLibC)
will return 0 and leave errno unset when no digits are converted,
while other libraries (FreeBSD and musl) will set errno if no
digits are converted.  This means that even setting errno to zero
before calling, then checking it if the return value is zero is
not enough to catch errors.

This actually led to Windows and (most) Linux systems not being able
to download the web lists because of a bug where it was converting
starting in the middle of the string rather than where the numbers
are.  It worked fine on Alpine Linux and FreeBSD though.

content-length: and content-transfer-encoding: were badly broken.

I'm totally perplexed that none of the compilers we have warned about this
obvious incorrect usage of the toggle_flag() function. Not warning about
passing false (0/NULL) for a char* makes some sense, but not the passing of
a const char* in place of a bool (int)? Maybe we should be building with
-Wall?

Thanks Microsoft!

If we called accept(), it's not datagram, and if you're using SCTP
and Synchronet lies to you, you can fix it yourself.

For use by broker.js which now requires a Sysop User ID and password
as the TLS PSK, and requires the system password in the MQTT password
field.

Because of the way this script is invoked from str_cmds.js (using js.exec)
any exceptions were just silent failures, making debugging issues
(e.g. the recent regression with the global ascii() function) difficult.

vert.synchro.net is taking > 15 seconds after initial IRC version notice

As Nelgin pointed out, there are a few hard-coded strings in the C++ source
with attribute (Ctrl-A) codes still.

This commit takes care of 5 of them:
- TelnetGatewayPrompt
- QWKEndOfMessage
- QWKTagLineFmt
- QWKControlCommand
- QWKBadControlCommand

Yes, you can do the same thing with timed events, pretty much

Embarassingly, I'd added SS_NEW_DAY recently (for a different purpose) with
such a similiar name. So let's rename this flag since it serves a very
different purpose and avoid the confusion between the two flags.

This hasn't done anything SBBSv3 - no way to enter internal user editor
recursively.

When passed null or undefined, it needs to return null or undefined.

Document that behavior.

It's CryptCert.FORMAT.XXX

Add a nextPacket() method that will get the next packet
Add a Connection.parseBytes() method to consume the rx_buf
Simplify Packet.newBytes() to only do socket recv()
Clear RX buffer when closing socket

- Increment bytes required for every extra VBI byte we learn about
- If sock is null, don't look at sock.connection
- Set sock to null after close
- Don't read from sock unless we need some bytes
- If we already have some bytes, parse them

There's a couple hacks in here that should be refactored though.

This appears to be why it was hanging. :D

This is not nearly ready for full-time yet, but it seems to mostly
limp along fine... there's some issues with the callbacks and such,
and the TLS support isn't currently usable by Synchronet.

Worth committing though.

Internal codes are always treated as keys (in a database sense) and should be
unique, but they weren't always enforced to be unique in SCFG. There's still
a few config items with internal codes that aren't forced unique (e.g. chat
channels).

File Library short names and Mesage Group short names are also key values and
must be unique and that's now enforced as well.

Remove the default name for new File Libraries and Message Groups (which are
likely duplicate anyway).

Used in combination with K_EDIT, if the string isn't actually changed, return
-1 (same as abort/ESC).

This allows the elimination of some save/compare/copy code in SCFG where we
only care to even look at the string if it was changed from its existing
value.

Broken when I removed the ALT-X shortcuts for ANSI/Curses modes.

Should fix issue #188