Fixes and improvements
- General: add limit on AU (AAC units) and NALU (H264 units) sizes in order to prevent RAM exhaustion
- RTSP source: support AUs wrapped inside ADTS (#855)
- RTSP source: fix timeout that happens when there's a UDP->TCP switch and Content-Base contains an absolute URL (#897)
- HLS muxer: fix PCR insertion when stream is audio only
- HLS muxer: update primary playlist in case SPS/PPS changed
- HLS muxer: remove progressive flag; add liveSyncDurationCount, liveMaxLatencyDurationCount to hls.js
- HLS muxer: upgrade hls.js