Plot response function

Brad Caron & Paolo Avesani
Generate a png image of the response function from CSD projected onto a sphere. This code was originally written by Paolo Avesani for the O3D Nature Scientific Data paper (code: https://github.com/brain-life/o3d-code/blob/master/figures/plot_response.py; paper: https://www.nature.com/articles/s41597-019-0073-y)
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