Changed cwlviewer.py to make node color dependent on operation class

[RenskeW]

Node color/style:

• CommandLineTool: "lightgoldenrodyellow", "filled"
• Workflow: "#F3CEA1", "filled"
• Operation: [no color], "dashed"

CommandLineTool & Workflow now have the same color as cwlviewer.

[codecov]

Codecov Report

Merging #1655 (bf8be2d) into main (d8b36d5) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1655      +/-   ##
==========================================
- Coverage   66.82%   66.81%   -0.01%     
==========================================
  Files          93       93              
  Lines       16578    16586       +8     
  Branches     4404     4404              
==========================================
+ Hits        11078    11082       +4     
- Misses       4361     4365       +4     
  Partials     1139     1139              

Impacted Files	Coverage Δ
cwltool/cwlviewer.py	98.90% <100.00%> (+0.05%)	⬆️
cwltool/cwltool/cwlviewer.py	21.97% <0.00%> (-1.02%)	⬇️

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[mr-c]

Super! Can you add a test case that confirms the expected outcome? Perhaps using an workflow with each type of step represented?

Bonus if you paste in a picture of the resulting graph as a comment here 🙂

[RenskeW]

[mr-c]

Huzzah!