Dask-geomodeling

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- Added Exp, Log and Log10 RasterBlocks.

- Added "std" and "var" statistics to TemporalAggregate.

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- Fixed point requests for RasterizeWKT.

- Allow empty coordinate list in Place.

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- Make transformation exceptions more comprehensible.

- Check for matching time resolutions in raster.Clip.

- Added 'product' to raster.reduction STATISTICS.

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- Fix point requests in raster.Smooth.

- GDAL 3 compatibility fixes.

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- Implemented `RasterTiler`.

- Let raster.Mask accomodate int values larger than uint8.

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- Accept categorical values in GeometryFileSink / to_file.

- Fixed incompatibilities with geopandas >=0.7.

- GeoJSON output is always converted to EPSG:4326 and doesn't have "crs" field.

- Implemented raster.reduction.reduce_rasters.

- Added the 'statistics' argument to raster.spatial.Place to deal with
overlapping features.

- Allow point requests in raster.spatial.Place.

- Clarifications about raster cell validity ranges in MemorySource and
RasterFileSource.