code: def register_classes():
      
      Gtlink_select.register_class()
      Gtlink_bin.register_class()
      Gtlink_expcube2.register_class()
      Gtlink_scrmaps.register_class()
      Gtlink_mktime.register_class()
      Gtlink_ltcube.register_class()
      Link_FermipyCoadd.register_class()
      Link_FermipyGatherSrcmaps.register_class()
      Link_FermipyVstack.register_class()
      Link_FermipyHealview.register_class()
      Gtexpcube2_SG.register_class()
      Gtltsum_SG.register_class()
      SumRings_SG.register_class()
      Vstack_SG.register_class()
      GatherSrcmaps_SG.register_class()
      Healview_SG.register_class()
docs: Register these classes with the `LinkFactory`