- Update to version 2.16
  * New:
    + plot mode, which displays average of FFT bins.
    + "Fill" plot mode, which displays both maximum & average of
      FFT bins.
    + "Histogram" plot mode, which displays distribution of FFT
      bins.
    + Selectable plot scaling: dBFS, dBV/RBW, dbV/√Hz, dBm/RBW, dBm/Hz.
    + Min hold line in plot.
    + A/B measurement markers on plot.
    + Plot tooltip displays delta from demod frequency.
    + Dropped frames are indicated by red background in 
      FFT Settigns panel.
    + "Avg" waterfall mode, which displays average of FFT bins.
    + "Sync" waterfall mode, which mirrors averaged data from plot.
    + Support for RTL-SDR Blog V4 in AppImage and DMG releases.
    + Save FFT plot center frequency in settings.
  * Improved:
    + Peak detection algorithm.
    + Peak detection uses peak hold data when available.
    + Maximum FFT size increased to 4M.
    + Maximum frame rate increased to 500.
    + Averaging slider is consistent across frame rates.
    + Visibility of text in axes.
    + Full support for high-DPI screens in plot & waterfall.
    + Plot & waterfall performance.
    + Plot can be zoomed & resized while DSP is stopped.
    + FFT window setting is stored as a string.
    + Waterfall span setting is stored in milliseconds.
    + Added 6 dB attenuation to WAV file recordings to prevent
      clipping.
    + Use logarithmic scale for frequency zoom slider.
    + Reduced CPU utilization of demodulators.
    +  Properly handle smooth scrolling.
    + Shorten band names to fit in narrow spaces.
    + Delay plot & waterfall drawing until samples arrive from
      hardware.
  * Changed:
    + Frequency zoom slider zooms around center of display.
    + Disallow scrolling beyond the FFT frequency limits.
    + Default narrow FM deviation increased to 5 kHz.
  * Fixed:
    + Time on waterfall is calculated correctly.
    + Frequency is correctly rounded in I/Q filenames.
    + Crash in AFSK1200 decoder.
    + Hang when setting a very narrow filter width.
    + Inconsistent 1-2-5 scaling of amplitude axis.
  * Removed: "Save waterfall" feature.

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