Connected spectrum model to power spectrum instead of plain real fft
Simplified initialization code a bit
Created spectrum bar display for swing application
Made spectrum bars values calculation a general functionality, for sake
of easier android porting
Extracted channel-bookkeeping-related parts from WaveFunctionModel
Added model describing currently processed part of the wave (N samples
before the lates).
Added appropriate visualisation for swing demo.
Tweaked logical structure of swing demo model, to emphasize its'
hierarchical nature.