Several fixes
Improved DTLS timer and retransmissions;
Added a helper to parse on/off configuration values;
Added API command to enable/disable streaming mountpoints;
Added a (commented) H.264 sample mountpoint to the streaming configuration;
Improved SSRC multiplexing in the Video MCU;
Added a new way to trigger the end of trickle candidates;
Some more fixes here and there
Fixed bad quality (low bitrate) video in MCU on recent Chrome versions
merging in the main changes
merged record.c