Add plantuml.autonumber property for sequence diagrams #431
Description
Description
It can be an important features of large sequence diagrams to be able to refer to steps by their numbers.
Plantuml has this option natively - adding "autonumber" on top of the files.
I'd like to add this as an option through an additional plantuml.autonumber StructurizrPlantUMLExporter and C4PlantUMLExporter property - set to false by default to be backward compatible.
Happy to do a PR but i just read the guidelines to open an issue first, so I don't want to create too many PRs in case they get rejected later. Please confirm whether that's fine for me to create a PR.
Thanks
Priority
Low (I have no budget and there's no rush, please add this feature for free)
More information
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