Added description line for the "Post-processing scripts".

ogStaticText id extended for SetPathEnd() function. It allows to use description line like a hyperlink

src/slic3r/GUI/GUI_App.cpp

@@ -1487,6 +1487,7 @@ void GUI_App::update_fonts(const MainFrame *main_frame)
     m_normal_font   = main_frame->normal_font();
     m_small_font    = m_normal_font;
     m_bold_font     = main_frame->normal_font().Bold();
+    m_link_font     = m_bold_font.Underlined();
     m_em_unit       = main_frame->em_unit();
     m_code_font.SetPointSize(m_normal_font.GetPointSize());
 }