Threedi-schema

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- Disable `convert_to_geopackage` in `schema.upgrade` for schema version before 300
- Ensure `revision` format in `schema.upgrade` is correctly formatted

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- Implement changes for schema version 300 concerning simulation settings
- Reduce all settings tables to a single row. Multiple settings per schematisation are no longer allowed.
- A full overview can most easily be obtained from the migration code (`threedi_schema/migrations/versions/0222_upgrade_db_settings.py`); to summarize:
- Rename settings tables from "v2_foo" to "foo"
- Rename several columns in settings tables
- Move settings to context specific tables instead of a single generic table

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- Remove column vegetation_drag_coeficients from v2_cross_section_location (sqlite only) that was added in migration 218

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- Add support for geopackage
- Remove `the_geom_linestring` from `v2_connection_nodes` because geopackage does not support multiple geometry objects in one table

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- Fix not setting views when using upgrade with upgrade_spatialite_version=True on up to date spatialite

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- Update v2_cross_section_location_view with vegetation columns