Add PlantUML Compiler / Pretty Printer for Model Visualization

[EthanJamesLew]

Summary

• add plantuml option to CLI to generate feature model diagram program
• create basic org.plantuml.ast with visitor
• implement a compiler to go from clafer ast to plantuml ast
• implement a pretty printer to generate plantuml code

CC @podhrmic

[EthanJamesLew]

@podhrmic this gets us most of the way there.

[sonatype-lift]

🛠 Lift Auto-fix

Some of the Lift findings in this PR can be automatically fixed. You can download and apply these changes in your local project directory of your branch to review the suggestions before committing.¹

# Download the patch
curl https://lift.sonatype.com/api/patch/github.com/EthanJamesLew/chocosolver-sysml/2.diff -o lift-autofixes.diff

# Apply the patch with git
git apply lift-autofixes.diff

# Review the changes
git diff

Want it all in a single command? Open a terminal in your project's directory and copy and paste the following command:

curl https://lift.sonatype.com/api/patch/github.com/EthanJamesLew/chocosolver-sysml/2.diff | git apply

Once you're satisfied, commit and push your changes in your project.

Footnotes

1. You can preview the patch by opening the patch URL in the browser. ↩