IPixelStreamingStreamer::OnStreamingStarted

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