Branch “refactor”:

• Multi-threaded application using C++11 threads.
• CmdParser class that eats commands and executes various things (updates Gconf_s/Compose_s)
• spawns other threads and passes three parameters to them:
  • Gconf_s - contains variables like framerate and resolution
  • compose - vector of pointers to Compose_s, each element describes one signal source
  • compose_mtx - mutex to protect that vector
• data:
  • audio samples are read into queue
  • video samples into preallocated vector, because there are 100 MB/s of it and I don't want to have allocations and deallocations in queue
• AudioReader.cpp, VideoReader.cpp - reads audio/video into “compose”
  • each signal source has one reader thread
• AudioStreamer.cpp, VideoStreamer.cpp - reads “compose”, combines frames and outputs them