Fixes and improvements
- RTSP server: change default RTSPS port (#867)
- RTSP server: fix reading with ffplay and stateless ipv6
- RTSP server: fix reading with multicast when host is macOS (#895)
- RTSP source: support AAC tracks with custom sizelength, indexlength and indexdeltalength
- RTSP source: fix parsing of transport header with dahua rtsp server (bluenviron/gortsplib#121)
- HLS muxer: add EXT-X-INDEPENDENT-SEGMENTS tag
- HLS muxer: do not increase version number of MPEG-TS tables unless there's a reason (asticode/go-astits#38)
- HLS muxer: fix crash in case of null SPS
- HLS muxer: add EXT-X-VERSION to primary playlist