on_update notification

http get method for notifications

implemented seamless vod seek. improved status message sending

fixed live timestamps, added synchronization & atc

added vod http

connection dropper in control module

added deps to build system

exec_kill_signal directive

added HLS timestamp rearrange to fix conversion from 1KHz RTMP to 90K…

…Hz MPEG-TS/HLS

implemented HTTP control module & record control