Fix Too many NT publishers error if getting sim state for many steps #104.

[brettle]

Fix #104

[CoolSpy3]

I did some quick investigation into the build failure. This issue states that it's probably a result of something calling System.exit(). Our code doesn't do that, and the code does build locally, so I'm not going to block merging, but we can keep an eye out and see if it happens again in the future.

[brettle]

Here's the CI log. The "Connection reset by peer" is consistent with some process exiting unexpectedly. Since we don't call System.exit(), I suspect the JVM is crashing, possibly due to a bug in native WPIlib code.