IPixelStreamingStreamer::OnStreamingStopped

A getter for the OnStreamingStopped event. Intent is for users to call [IPixelStreamingModule::Get()](API\Plugins\PixelStreaming\IPixelStreamingModule\Get).FindStreamer(ID)->[OnStreamingStopped()](API\Plugins\PixelStreaming\IPixelStreamingStreamer\OnStreamingStopped).AddXXX.