Threedigrid

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- New release since 1.2.1 was already present at PyPi.

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- Added new OGR based exporter for Geopackage exports.
Currently only has default export settings for lines, cells, nodes and pumps.

- Fixed error in crs attribute.

- Removed deprecation warning on gridadmin.breaches and added it to
gridadmin.lines.breaches.

- Fixed export_breaches for new gridadmins.

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- Added discharge_coefficient_positive and discharge_coefficient_negative
to breaches.

- Removed threedicore version check on GridH5ResultAdmin initialization.

- Added crs attribute to GridH5Admin. Pyproj >=2.2 is required.

- Drop python 2.7 support.

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- Fix geometry selection filtering, gridadmin can now contain nan values.

- Added dimp attribute to nodes.

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- Added flod and flou attributes to lines for possible reading obstacle heights.

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- Added 'has_dem_averaged' attribute to cells.