[Gui] add recompute icon to context menu
[Gui] add recompute icon to context menu

as discussed here: https://forum.freecadweb.org/viewtopic.php?f=34&t=57139&start=10

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