v0.18.1

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