handle MIMO tf feedback and division by converting to ss

[baggepinnen]

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[JuliaControlBot]

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Plots were compared to references. 3/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.58%. Comparing base (23982a4) to head (fc0bd85).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ControlSystemsBase/src/connections.jl	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1007      +/-   ##
==========================================
+ Coverage   92.52%   92.58%   +0.05%     
==========================================
  Files          41       41              
  Lines        5099     5108       +9     
==========================================
+ Hits         4718     4729      +11     
+ Misses        381      379       -2     

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