docs: def register_plugins():
      """find any installed plugins and register them."""
      if pkg_resources:  # pragma: no cover
          for ep in pkg_resources.iter_entry_points('slam_plugins'):
              plugin = ep.load()
  
              # add any init options to the main init command
              if hasattr(plugin, 'init') and hasattr(plugin.init, '_arguments'):
                  for arg in plugin.init._arguments:
                      init.parser.add_argument(*arg[0], **arg[1])
                  init._arguments += plugin.init._arguments
                  init._argnames += plugin.init._argnames
  
              plugins[ep.name] = plugin