net/liveMedia: update 2020.04.06

2020.04.06:

• Removed support for the classes "RTSPServerSupportingHTTPStreaming" and "TCPStreamSink". These were being used (in the "LIVE555 Media Server") for streaming using "HTTP Live Streaming" (HLS). This was always a hack; it is better to use a dedicated HTTP server to serve HLS segments, rather than trying to implement a HTTP server (serving 'virtual HLS segments) within our own (primarily RTSP) server.
  
  If you are looking for HLS support, note that we provide a source-code demo application "testH264VideoToHLSSegments" that converts a (static) H.264 Elementary Stream file to HLS segments, and the "LIVE555 HLS Proxy", which proxies a live RTSP/RTP stream to HLS segments.