add loopshapingPD

[baggepinnen]

needs tests

[JuliaControlBot]

This is an automated message.
Plots were compared to references. 4/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
✔️ 0.0
✔️ 0.0
✔️ 0.0
✔️ 0.0

[codecov]

Codecov Report

❌ Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.04%. Comparing base (8f2f89b) to head (62bed5a).

Files with missing lines	Patch %	Lines
lib/ControlSystemsBase/src/pid_design.jl	0.00%	28 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1040       +/-   ##
===========================================
+ Coverage   19.74%   91.04%   +71.29%     
===========================================
  Files          42       42               
  Lines        5525     5615       +90     
===========================================
+ Hits         1091     5112     +4021     
+ Misses       4434      503     -3931     

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