Doesn't seem to work. Maybe the service has to be install and up first
(cause it worked at one time). Oh well, with the menu option added, the
sysop can just reset it the first time manually.

Side note: Is it "Trade Wars", "TradeWars", or "Tradewars"? All 3 are used
interachangeably. I'm going with the former.

The game is much easier to play when the monsters don't move. :-)

A clock_t is bigger than an int on 64-bit Linux systems, so there
was some weirdness with the tick offset that caused monsters to
never move.

Use the same terminal ctrl key values as sbbs.
getstr() might need some love here (especiall left/right arrow).

As of Oct-25-2018, the NO_EXASCII flag was set in the autoterm variable
when there was no ANSI terminal auto-detected. This defeated the short
inactivity timeout feature of login.js because it was checking specifically
for a zero-value autoterm.

So change this logic to check for no ANSI, PETSCII, or UTF-8 (the 3 indicators
of a valid terminal) - though I suppose PETSCII is questionable (it's not
actually auto-detected, just a non-standard port usually).

send_telnet_cmd() now sends telnet commands/replies directly to the client
socket. This avoid the entire output_thread() teeing of sent data to spy
sockets/buffers (which may not be Telnet at all).

There are some concerns with this change:
- if client_socket isn't writable, will sendsocket() block?
- if output_thread is sending on the same socket, are our 2/3-byte telnet
  commands going to have other output data interleaved within? (seems very
  unlikely)

Strip all *but* the expected keyboard input sequences (arrow keys, pgup/dn,
home, end, insert). Pass-through a bare ESC key (albeit with delay). ESC
immediately followed by a key other than '[' should be very quickly passed
through.
Increase the max ANSI sequence length from 31 to 256 chars.

This enables node-spying via SSH or spying on a node that is using SSH.
Thanks Altere for the bug report.

Where the LetSyncrypt challenge-response file is placed.

Mostly copied from
https://github.com/echicken/synchronet-web-v4/blob/master/.gitignore

betwen 4 (the default) and 40 (the maximum) characters

Don't cache .o files. This appears to not work 100% (e.g. it's always rebuilding cryptlib anyway and it failed to re-compile some of libsbbs.so resulting in a link failure).

This bug would cause the split-screen separator to repeat when the local
side scrolled (if the terminal was 24 rows, bug didn't happen when local
screen was 25 rows).

This bug appears to have "always" been there. The split-screen separator is
80 columns, so that forced a line wrap on the subsequent CRLF and the local_y
value was "off-by-one". Just use ansi_gotoxy() instead and put the cursor
where you think it is.

Also, support > 24 row terminals for longer chat history (bottom half only).

When a sysop wants to chat, he wants to chat right now, damnit!