* Move out of BufferPool because it's not related to memory allocation
* Rewrite because memset() is not portable because it sets all bytes to
zero which depends on the platform's float representation of 0.0 to be
all zero bytes
Adjust Mixer::getPeakValues so client do not have to allocate the
variables that will store the peak values.
Adjust both existing clients: FxMixer and VisualizationWidget.
Make the oscilloscope colors available as properties so that they can be
changed via style sheets. Adjust the existing styles to use the colors
that have been hard coded previously.
Cleanup the paintEvent method of VisualizationWidget, e.g. by extracting
a method to determine the color to use for the line and by pulling
variables to the place where they are used. Fix some Clang warnings.
Removes some repeated calls to Qt's font layouting by using QStaticText
in FxLine and removing the overridden method ComboBox::sizeHint.
Unifies Mixer::peakValueLeft and Mixer::peakValueRight into
Mixer::getPeakValues so the array is only iterated once.
