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I try to add a nice visual of the generated waveform.
I'm storing the samples onto a circular buffer up to the capacity 1024. (~18.5 ms of signal)
When it's not busy, it will be transfered on a secondary buffer for thread-safe use.
The second commit adds the graphical widget.
The display is functional and nice, but I don't know too much how to lay it out without eating too much space. In this regard, current form is not very pleasing and should be rearranged.