Future Commit: You will want to implement a separate collection of commandline/sage_support methods in the X10 namespace, e.g. `Rose::Cmdline::X10::Ecj::GetRoseClasspath()`. Take a look at `ROSE/src/frontend/SageIII/sage_support/sage_support.[cpp,h]` and `ROSE/src/frontend/SageIII/sage_support/cmdline.[cpp,h]`.