Use dependency injection

OK, but not all of the methods in that class are static! And the parent class already implements ContainerFactoryPluginInterface, so all we need to do is use the $instance = parent::create() pattern.

• defineOptions(), optionsSummary(), and buildOptionsForm() need the module_handler service injected
• buildOptionsForm() also needs the stream_wrapper_manager and plugin.manager.facets.facet_source services injected

whoops, wrong version