add log function to build strings for vectors
add log function to build strings for vectors

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