warning: format not a string literal and no format arguments

Caught by CID 331001

The use of SAFECAT() with a typecast to a pointer is not going to work as expected. This change broke line-based telnet-gateway functionality (unconfirmed, but pretty obvious).

Likely the cause of the crash that killed cvs.synchro.net last night

Specifically, have errors mean the fd is "ready".

Also, fix some extra revent clearing and a spy socket issue while
we're looking at this code.

Should fix issues with CGI scripts that close stdin/stdout but do
not terminate, and maybe deal with some other corner cases at the
same time.

Tabs are the shit.

For easier use of the auto-generated echo-tags in JS.
And a helper function sub_area_tag(), now used in SCFG too.

Previously, timed or polled callbacks were required to keep the
event loop running.

This should allow callbacks to not interfere between (say) shells
and doors.

I haven't added a clearImmediate() because there's currently no way
of manipulating the run queue, and I can't come up with a reason
someone would actually need it.

Was terribly broken.

This macro has expanded to nothing for a while now and even before, the usage was misguided and unnecessary as explained in this video: https://www.youtube.com/watch?v=cjotPqQxxAY

Non-poll used the wrong value for calculating the high socket (which
is ignored on Win32, the only non-poll() user), and the socket was
being set in the wrong union member.

CID 319112

CID 33568

CID 174491

Caught by Coverity-scan CID 33178

CID 319077

This is so old/bad. CID 33179.

CID 33232

PROP_CHANGES already handled in if() condition
CID 33176

CID 319143

CID 319085 319089 319135 319142

CID 330990

Fixes CID 330973

CID 319023 319065 319134

CID 174483