Threedigrid

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- Bugfix: reprojection with no coordinates (empty array's)

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- Added `GeometryIntersectionFilter`.

- Added general GeoJsonSerializer which allows you to specify the field names
you want to serialize and extract to geojson. The GeoJsonSerializer allows
you to specify nested fields.

- Added a set of standard export fields for each model.

- Automatically pick the correct serializer based on file extention

- .json/.geojson --> to_geojson
- .gpgk --> to_geopackage
- .shp --> to_shape

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- Minor bugfix, need to check if h5py filepath is a str or bytes string
during initialization

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- First release with RPC integration.

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- Bumped version of asyncio-rpc

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- Fixed incorrect version number