Add exact frequency-domain translation of discrete systems to continuous time

[baggepinnen]

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[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (ee66b95) 33.86% compared to head (5627ee3) 33.85%.

Files	Patch %	Lines
lib/ControlSystemsBase/src/discrete.jl	0.00%	13 Missing ⚠️
lib/ControlSystemsBase/src/types/DelayLtiSystem.jl	0.00%	3 Missing ⚠️
lib/ControlSystemsBase/src/types/LFTSystem.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #902      +/-   ##
==========================================
- Coverage   33.86%   33.85%   -0.01%     
==========================================
  Files          42       42              
  Lines        4651     4667      +16     
==========================================
+ Hits         1575     1580       +5     
- Misses       3076     3087      +11     

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[JuliaControlBot]

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Plots were compared to references. 11/11 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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