Threedi-mi-utils

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- Nothing changed yet.

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- Modified is_schematisation_db() to deal with None version value.

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- Use get_version from threedi-schema in is_schematisation_db() check.

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- Backward compatibility for the schema < 300
- Added function to check if schematisation DB file is actually a 3Di schematisation data source.

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- Adjustments for the schema 300

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- Added QgsQgsNewsSettingsInjector (281)
- Added Github actions.