Export and import of objectID to value map

Mapping object IDs with their values and saving this map, provides a way to hand redacted diagrams to an LLM/agent to tidy up the layout without exposing sensitive information to third parties.

Workflow:

1. Input diagram
2. Save map of ID and value as json
3. Redact diagram by replacing values with placeholders of equal length (4. Save redacted diagram)

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1. Input redacted diagram and json
2. Restore values (3. Save restored diagram)