Support pdflatex

[koppor]

Ideas:

1. Use pythontex and the remote PlantUML server using Python's plantuml.

2. Build on checklistings, which generates a checklistings.sh file for the compiler. Drawback: Users have to call an external tool.

3. Use pythontex and its bash functionality to locally execute PlantUML.

   • This would also solve #2
   • Issue: Unclear how I get latex counters into the bash code: https://tex.stackexchange.com/q/419102/9075

4. Use bashful to execute bash scripts.

The package download can download files, but this does not help much here as we can also download plantuml within a bash script.

[koppor]

Alternative: Align with the plantuml.sty project.