live stream synchronization
initial implementation of control http module
minor fixes in control module
improved manual recorder: keyframes, repeated open/close
implemented control section/method parsers; added returning file path
fixed formatting
fixed http output
merged master into sync

o sync

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implemented absolute timestamp feature (atc on)
fixed live timestamps in non-atc mode
added record_notify feature
Merge branch 'control'
added 'busy' directive
implemented MPEG-TS sample re-arranging in HLS stream to fix crackles because of low-resolution timestamp in RTMP vs MPEG-TS
fixed logging
fixed AAC real sample rate parsing
fixed AAC header parser
fixed compilation
fixed pts assignment while synchronizing hls
added option for choosing exec kill signal