Remove SimpleNetObject from C++ SimObject Based Classes

[lukaspj]

SimpleNetObject is just an example object and should be removed from the SimObject based classes, as it creates issues in the SafeNativeMethods.cs file. This is probably because SimpleNetObject has it's class definition inside the .cpp file and not the .h file. It doesn't have any relevance to the actual game logic so it should just not be generated at all.

I can't change this, as it is a StaticCodeGenerator issue.

Partially solves #20.

[lukaspj]

Oh, this isn't possible because removing it makes the parser unable to finish because it doesn't know what to do with the class or something.. It should still just be ignored though, what about having an "ignore" list?