Enable binary-transmit mode in server by default, disabling CR->CRLF expansion

Don't expand CR->CRLF when in binary mode that was requested locally
(option value is DO, instead of WILL), using new telnet_opt_enabled().

Request binary-transmit mode by default in Telnet server/answer mode.
Set ServerBinary=false in svdm.ini to disable.

This fixes the extra line-feeds in Telnet-server mode.
14 jobs for dailybuild_linux-x64 in 9 minutes and 53 seconds (queued for 15 seconds)
Status Name Job ID Coverage
  Build
passed jsdoor-freebsd #36047
FreeBSD

00:03:55

passed jsdoor-linux #36048
Linux

00:06:54

passed jsdoor-windows #36050
FreeBSD

00:01:54

passed sbbs-freebsd #36042
FreeBSD

00:05:27

passed sbbs-linux #36037
Linux

00:09:47

passed sbbs-windows #36040
Windows

00:05:20

passed sexpots-freebsd #36049
FreeBSD

00:00:17

passed sexpots-linux #36038
Linux

00:00:17

passed sexpots-windows #36041
Windows

00:00:33

passed syncdraw-freebsd #36045
FreeBSD

00:00:30

passed syncdraw-linux #36046
Linux

00:01:02

passed syncterm-freebsd #36043
FreeBSD

00:01:11

passed syncterm-linux #36039
Linux

00:03:01

passed syncterm-windows #36044
FreeBSD

00:01:49