0.0.8.2 video sync by audio peak

Created by: bmarv

synchronization possible with this additional merging strategy. The client-videofiles are analyzed regarding their audio loudness. For every timepoint is a decibel value assigned, from which the moving averages are computed for 7 timeframes to normalize the loudness for the timepoints with the neighbors. An Audio Peak happens, when the moving average changes by + 20db for the following timeframe, which means that the client-video will start at that time. This merging strategy is only relevant, when all clients start singing/playing in a really silent environment, where no distracting sounds are there.