Adds a new type of import configuration.
This configuration allows to define a single resource.
All the resources referenced via schema:containsPlace will be imported.
Relates: #10237
- Removed individual converters for TYPO3.
Conversion is now handled in a single converter.
- The new converter will import necessary dependencies upfront, e.g.
town or organisation.
- Move import state into extra class.
Relates: #34