Karta

- major refactor of geometry hierarchy
- adds Multiline and Multipolygon classes
- polygon vertices are double-nested in order to represent sub-polygons
- only multipart geometries now contain a data attribute
- GeoJSON now attempts to project all data to geographical WGS84 coordinates as
per https://datatracker.ietf.org/doc/draft-ietf-geojson/
- `force_wgs84=False` can be set to avoid this behaviour
- multivertex geometries now use CoordString as a data backend, which should
permit faster operations on the C side
- rename `Line.subsection` -> `Line.to_npoints`
- new R-tree implementation in C
- `projected` keyword argument added to `Point.distance`, `Point.azimuth`, and
`Point.walk` to control whether geodetic or planar algorithms are used with
the CRS is not geographical
- replaced polygon membership testing algorithm with a winding number-based test
- implemented fallback algorithm for polygon membership testing in polar regions

- implement raster bands
- redesign raster interface and introduce [:,:] array syntax rather than values
attribute
- replace pyshp with OGR
- deprecate some CRS classes in favour of Proj4-backed CRS
- nodata improvements for raster grids

- R-tree implementation for indexing multipoint geometries
- bounding box caching for performance

- python implementation of geodetic solutions on spheres and ellipsoids
- geodetically-correct area calculations with GeographicalCRS
- more complete geojson interface supporting nested GeometryCollections
- no longer supporting pure-Python mode (C-extensions required)
- `RegularGrid.clip` performance improvements
- added `Multipoint.convex_hull()`, returning a Polygon
- CRS objects can often report WKT and proj.4 strings (mostly depends on osgeo)
- continuing to improve CRS support in GeoJSON driver
- automatic CRS support for shapefiles
- Multipoint now uses quadtree internally for certain methods

- renamed `vector.guppy` -> `vector.geometry`
- `NODATA` support for raster grids
- raster grid clipping
- `gtiffread` based on GDAL
- refactor `karta.crs` with a simpler interface
- affine transforms of vector geometries

- `GeoJSONReader` simplifications
- implement `__geo_interface__`

Changes with 0.2 series

- quadtrees for point data
- implemented `karta.crs` to handle coordinate reference systems
- shapefile IO improvements