Threedigrid-builder

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- Handle embedded connection nodes. These are removed from the grid and written to a
new dataset "nodes_embedded".

- Fixed bug with cross sections tables being None in Grid instance

- Handle embedded channels, pipes and culverts. Embedded objects result in
embedded nodes and and lines with kcu LINE_1D_EMBEDDED between between 2D cells.

- Fixed a bug with lines that connect nodes to themselves in quadtree generation.

- Fixed a bug with wrong usage of lines.ds1d in bottom level and cross section weights
computation. The added attribute lines.s1d is now used, and for clarity nodes.ds1d
was renamed to nodes.s1d.

- Added invert_level_start_point and invert_level_end_point attributes to lines.

- Fixed coordinate order in lines.line_geometries field in gridadmin.h5.

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- Read and convert cross section definitions.

- Solve gridadmin off-by-one errors for pumps.

- Add 'dmax' to nodes output.

- Changed external API function name to "make_gridadmin".

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- Fixed issue when reprojecting 0 grid refinements with pyproj 2.*

- Fixed issue when writing 0 pumps with h5py 2.*

- Fixed missing transpose when writing pumps.coordinates to HDF5.

- Added obstacles.

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- Added threedigrid_builder.grid.geo_utils with segmentize and line_substring functions.
These are used to compute the Lines.line_geometries for channel lines.

- Fixed a bug in the refinement areas code (Fortran) on Ubuntu 20.04.

- Added the Pipes model that is able to compute Nodes & Lines from Pipes.
Pipes are also included in the calculation_type and bottom_level computations.

- Added 1D-2D lines for connection nodes, manholes, and channels.

- Added culverts, orifices, and weirs.

- Added pumps (pumpstations).

- Settings and metadata are read from the SQLite. Some metadata (like model_slug) can
also be provided via the main (make_grid) function. The metadata is written to the
root 'attrs' of the output gridadmin.h5. The settings are written into datasets inside
newly addres groups "grid_settings" and "tables_settings".

- Fixes for models with no channels.

- Add an optional progress callback.

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- Added public API with 1 function: `threedigrid_builder.make_grid`.

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- Fixed automatic PyPI upload.