Display thread stack limit (if not unlimited).

Created sbbs_read_js_settings() and sbbs_set_js_settings() to read and write
all settings to/from .ini files in a modular fashion.
This is a precursor to implementing support for JavaScriptThreadStack (limit)
support for all JS-enabled servers and services (working around the ircd bug).

(for JS engine thread stack limit).

file.

web_root_dir/graphics/logo.gif is present display it, else display system.name.

Wait for Deuce's glare :)

Use Alt for SysOp shortcupts, not Control... thereby NOT hijacking
such little-used keys such as ^H, ^C, and ^X

sysops not running the Synchronet webserver.  (Basically, the old
design, different colours - subject to change with strftime() instead
of old date() function.  No CSS and no graphics.

Removed all the links at the top of the file, removed street address from
bottom.

This should speed up the unsorted userlist quite a bit indeed.
(ToDo: Why is sort so damn slow?  Can I blame the branch callback?)

variable to enable)

This resulted in the rotating message line colour staying the same.

Added comments regarding ZF3 value in ZRQINIT header.

======== THERE IS NEW SYNTAX ========
It is absolutely forbidden to include one tag inside another... NO
execptions anymore.  This one will have the largest impact.  Essentially,
@@JS:if(somevar)then'@@something:else@@'else''@@ will *NOT* work.
Now, if you want to access to current iteration of the repeated array
inside a <<REPEAT objname>> section, it's available inside of JS: bits as
RepeatObj.  This should remove all need for nested tags.

A new convinience functions has been added... Nz(value[, valIfUndef])
returns valIfUndef (defaults to the empty string) if value is undefined
and value if it IS defined.