Added a () operator overload to treat ConfigOptionSingle like functions and return their value (accessor)
Added a () operator overload to treat ConfigOptionSingle like functions and return their value (accessor)

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