title: What version of C# is supported by the relevant flowgear nodes?
body: <p>I have done all the searching I can think of, and I don't see anything stating which version of C# is available for Script, Expression, or other nodes where C# syntax is used.</p>
  <p>So I keep trying to use things like string interpolation or declaring out values inline as arguments, and they work fine where I first try them, in VS, but of course the nodes error-out once I copy-paste and try to run them in flowgear proper.</p>
  <p>If someone in-the-know could answer here, that would work almost as well as if the actual <a href="https://help.flowgear.net/" rel="nofollow noreferrer">Flowgear Help Center</a> had that information.</p>