message: Remove long-deprecated config options
diff: @@ -153,10 +153,6 @@ actor_system_config::actor_system_config()
  "sets the verbosity (quiet|error|warning|info|debug|trace)")
  .add(logger_inline_output, "inline-output",
  "sets whether a separate thread is used for I/O")
  - .add(logger_file_name, "filename",
  - "deprecated (use file-name instead)")
  - .add(logger_component_filter, "filter",
  - "deprecated (use component-filter instead)");
  opt_group{custom_options_, "middleman"}
  .add(middleman_network_backend, "network-backend",
  "sets the network backend to either 'default' or 'asio' (if available)")
  