Tech ENABLE_GL_CORE_PROFILE - Use OpenGL core profile context - 1st installment

Fixed conflicts during rebase with master

src/slic3r/GUI/Gizmos/GLGizmoMove.cpp

@@ -132,7 +132,9 @@ void GLGizmoMove3D::on_render()
     m_grabbers[2].center = { center.x(), center.y(), box.max.z() + Offset };
     m_grabbers[2].color = AXES_COLOR[2];
 
+#if !ENABLE_GL_CORE_PROFILE
     glsafe(::glLineWidth((m_hover_id != -1) ? 2.0f : 1.5f));
+#endif // !ENABLE_GL_CORE_PROFILE
 
 #if ENABLE_LEGACY_OPENGL_REMOVAL
     auto render_grabber_connection = [this, &center](unsigned int id) {