Remove MakePlots wrapper

[georgemccabe]

@malloryprow confirmed that the MakePlots wrapper is no longer used as of METplus v3.x, so we can remove it. There is a lot of logic in StatAnalysis wrapper that can be removed that will make it easier to enhance its functionality.

Describe the Task

Remove MakePlots wrapper and any references to it.

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Define Related Issue(s)

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• METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

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