Full Simulation Suite for NgSpice

[ThomasPluck]

Adds ease-of-use features for implementation of as-advertised simulation options in ngspice:

• DC Analysis
• Sweep Analysis
• Monte Carlo Analysis
• Custom Analysis

Has twin PR:

• Full Simulation Suite for NgSpice Vlsir/Vlsir#84

[codecov]

Codecov Report

Merging #187 (1940a7f) into main (edc6bb0) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

❗ Current head 1940a7f differs from pull request most recent head 3056a39. Consider uploading reports for the commit 3056a39 to get more accurate results

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   87.23%   87.22%   -0.01%     
==========================================
  Files         109      109              
  Lines        9680     9683       +3     
==========================================
+ Hits         8444     8446       +2     
- Misses       1236     1237       +1     

Files	Coverage Δ
hdl21/sim/data.py	91.32% <66.66%> (-0.31%)	⬇️

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[ThomasPluck]

Closing to remove clutter.