This is mainly updates to the build system, but there were a couple of
stdlib changes for the tests. The build system does include handling
more properly now as well, I think. It has fewer hacks, at least.
I don't have a single clue in heck if this actually works, but it at
least does compile. At some point I will probably add a test or two to
find out how broken this is.
This builds a very basic version of the nats.c client (no TLS, no
streaming/jetstream/whatever, since those bring in complex
dependencies and I do not need them at the moment). Right now it
contains a simple test program that demonstrates the functionality
(cool!), but the plan is for the nats.zig to bind the API into a
nicer, zig-like shape and re-export it. Then this becomes a package.
The current function could become a test, though it's a bit complex
for a unit test (and requires connecting to an externally-running NATS
server in order to work).
