Add plot_iir_filter_analysis() based on LTF-IIR-allgemein.ipynbcode from...

Eric Kooistrarequested to merge
RTSD-242 into master

Add plot_iir_filter_analysis() based on LTF-IIR-allgemein.ipynbcode from https://github.com/chipmuenk .

Closes RTSD-242

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