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spectrogram plugin: allow user to specify a colorMap (#1654)

* Added support for specifying a colormap for the spectrogram.

* modified colorMap to expect values between 0 and 1

* Modified spectrogram example to use a 'hot' colormap. The colormap is loaded from a json file.

* add documentation for generating colormaps. Add feature to change log.

* fixed colormap generation example code

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