v0.20 to v0.21

• To crop the extent of a RasterSource (or LabelSource), you now have to specify bbox instead of extent. The term “extent”, as used in the codebase, has also been redefined to always be the box Box(0, 0, height, width), where height and width are the height and width of the bbox.

• GeoJSONVectorSource can now take a list of URIs, allowing geometries to be read from multiple files.

• VectorOutputConfig (and subclasses) no longer require uri to be specified.