Threedigrid-builder

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- Only process cross section definitions that are actually used.

- Removed cross1 & cross2 in the in-memory or geopackage output and added cross_id1 and
cross_id2.

- Fixed bug where writing a single line geometry or geometries of equal size would
result in an incorrect cast to a numpy object dtype.

- Fixed bug with zero-d administration `cci` (index needs to be 1-based), removed `cid` field.

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- Fixed the Linux wheel distribution. These are now built with manylinux2014 instead of
manylinux2010.

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- Added support for zero-d administration including surfaces and impervious surfaces.

- Dropped support for Python 3.6.

- Fixed __version__ attribute and "threedigrid_builder_version" HDF5 attribute.

- Set the dpumax of a 1D line (channel, pipe, culvert, weir, orifice) always to the
largest of its two invert levels. Previously, it was set to the largest of the two
bottom_levels of the two adjacent nodes, which gave wrong results for lines attached
to manholes.

- Disable extrapolation for channel node/line attributes that are derived from
crosssection locations.

- Disable the SchematisationError when a Manhole has a bottom_level above a level
of a connected object. Instead, emit a warning through the logger.

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- Added has_max_infiltration_capacity flag.

- Added breaches and levees.

- Implement GDAL as an alternative to RasterIO.

- Check the raster EPSG code and use it if the model does not have one.

- Removed 'model_area_path' feature from application.

- Added an in-memory output interface. Supply out_path=None to instead of writing the
grid to a file, receive the grid as dictionaries of 1D ndarrays.

- Removed the "sqlalchemy<1.4" constraint, this library is compatible with SQLAlchemy 1.4

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- Raise SchematisationError on invalid settings.

- Removed SchematisationError on tabulated rectangle cross section definition with zero
first "width" value.

- Add calculation_type for nodes to be Dem averaged.

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- Fixed l1dtot (exclude 1D boundaries).