Version 1.5.0

• add collect() in Algorithm.hpp
• add Hex::decodeDigit() and decodeByte()
• Media deprecate track accessor methods, modify track semantics, add comparison functions
• PosixPlatformAdapter get interface ID on addUdpInterface()
• add Retainer
• TCMessage support Enhanced RTMP video tags
• URIParse resolve relative URI references, percent encode/decode
• add RTMFP::onUnmatchedRHello and sendIHello() for connectivity checkers
• add Flow::getERTO() and getMRTO()
• fix RateTracker::getRate()
• congestion control ensure CWND cuts on loss when CWND is less than outstanding
• peek in ping to infer mobility check to reset base RTT
• add test/conncheck connectivity checker
• test/tcconn take stream name from URI fragment
• test/tcpublish take stream name from URI fragment
• test/tcrelay support Enhanced RTMP
• test/tcserver
  • support Enhanced RTMP
  • authenticated user-specific parameters/constraints and "publisher name"
  • publish priority & preemption
  • move play real-time parameters to "query" portion of stream name
  • play of HEVC, AV1, VP9 wait instead of garbled video on play to avoid decoder errors
  • onRelay sender info is Object instead of just String