There were two large holes in the existing offline server handling:
1. It didn't include IPs, so scripts that used IPs instead of hostnames
would get exceptions thrown for "server not found."
2. Coverage was very low for non-Darknet APIs. Maybe most of them don't
need to be covered, but many obvious ones like "ps", "killall" and
"hasRootAccess" were missing. IMO the only reliable answer is one
that enforces *all* are covered via the type system.
To accomplish the second part, helpers.getServer() was changed to return
null when a server is offline. This intentionally breaks a lot of its
utility, which was to return a server unconditionally. To compensate,
its utility was increased - it now also does unknown argument
processing, allowing it to subsume a common line that all callers were
repeating.
Some callers switched to ctx.workerScript.getServer(), because they
didn't actually need to be using helpers.getServer(). Similarly, a few
callsites switched to GetServerOrThrow(), for the cases where it should
be guaranteed that the server is valid. The rest are returning a
default/failure response when the server is offline. (Except for
contracts, which threw on failure already anyway.)
