Speed up polygonizer, drop Python 2.7 and update requirements.

Merged Daniel Scheffler requested to merge enhancement/improve_polygonizer into master
  • Added test and test data for geo.raster.conversion.raster2polygon().
  • Replaced skimage downsampling by GDAL variant.
  • Removed scikit-image dependency.
  • Dropped Python 2.7 support due to end-of-life status.
  • Dropped compatibility module since this was Python 2.7 specific.
  • Dropped requirements six and packaging.
  • Added some docs/.rst files to .gitignore.
  • Updated minimal version of pyproj to 2.5.0.
Edited by Daniel Scheffler

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