Added template function to make getting references to ConfigOptions easier to write.
Added template function to make getting references to ConfigOptions easier to write.

curieos/Slic3r,alexrj/Slic3r,alexrj/Slic3r,pieis2pi/Slic3r,lordofhyphens/Slic3r,lordofhyphens/Slic3r,pieis2pi/Slic3r,curieos/Slic3r,curieos/Slic3r,alexrj/Slic3r,curieos/Slic3r,pieis2pi/Slic3r,pieis2pi/Slic3r,pieis2pi/Slic3r,alexrj/Slic3r,pieis2pi/Slic3r,lordofhyphens/Slic3r,curieos/Slic3r,curieos/Slic3r,lordofhyphens/Slic3r,alexrj/Slic3r,alexrj/Slic3r,lordofhyphens/Slic3r,lordofhyphens/Slic3r