[Spectral View] add valid data range option in visualization settings

[Andreas Rabe]

Automatic y-axis scaling is an important feature, but single outlier can break it, e.g.

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It is proposed to add a valid data range (vmin and vmax) option that allows to mask outlier data points. Place it somewhere here:

E.g. in the above example, setting a vmin=0 would exclude the outlier and produce a nice auto-scaled plot:

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[Andreas Rabe]

If possible, also expose the valid range setrting in the Spectral Profile Sources right under the Scaling settings:

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