Threedigrid

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- Make 'line_coords' the geometry on breaches geojson output.

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- Bugfix: Dataset instance check is not generic.

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- Added 'line_coords' to Breaches model and default export fields.

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- Added `meta` table to Geokpackage export with meta information about 3Di model.

- Added 2D groundwater boundary line types 600, 700, 800, 900.
Eextended the '2D_GROUNDWATER' subset.

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- Removed gridadmin.lines.breaches.

- Removed MappedSubsetArrayField.

- Added 'code' and 'display_name' to breaches.

- Added missing Geopackage fields `bottom_level` and `drain_level` for nodes. Renamed `connection_node_storage_are` to `connection_node_storage_area`.

- Dropped python 3.6 support.

- Fixed compatibility with shapely 2.*.

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- Optimized geojson export memory usage.

- Removed majority of properties from the flowlines (1D2D) export.