edmPluginHelp: print the plugin type as well as the name and library
edmPluginHelp: differentiate thread-safe legacy modules

For EDAnalyzers, EDProducers, and EDFilters, let
  `ParameterSetDescriptionFiller` check at compile time for global
  vs. stream vs. one vs. legacy modules, and return the appropriate
  description via `extendedBaseType()`

Make edmPluginHelp check for, and print, the extendedBaseType.
update unit test output