Create the "Servers" configuration sub-menu, currently read-only

I'm surprised more people haven't wondered aloud: why are all the Synchronet
server settings in this huge sbbs.ini file? Well... this kind of answers that
question: it's a hell of a lot of settings! And this isn't even everything
(several advanced/rarely-used/borderline-deprecated settings aren't included)!

As part of this change, I've replaced the old date/time display with the
current config file path/name that's being edited (more or less). This will
help when a sysop has multiple sbbs.*.ini files and makes it clear if you have
multiple sbbs installs (like me), which one you're editing at any given time.

I have not implemented any of the server setting edits (other than a couple
simple toggles) or help text yet and this does not detect changes or save them
to the sbbs.ini file, but I wanted to get this committed at this stage anyway.
If you're running sbbsctrl.exe (or maybe even gtkmonitor), then maybe this is
completely redundant and unnecessary, but I figured it was good to have these
settings in one edit find/edit platform-agnostic location anyway. Hoepfully
this will (when its done) make SBBS for *nix just that much easier for a newbie
sysop/sysadmin.