PD: [skip ci] fixes for pipe task panel + Add/Remove are checkable buttons so if user unchecks it then disable highlighting of spine + Avoid superfluous char* -> QString conversion
PD: [skip ci] fixes for pipe task panel
+ Add/Remove are checkable buttons so if user unchecks it then disable highlighting of spine
+ Avoid superfluous char* -> QString conversion

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master