arcgisutils 0.3.0

All geometry conversion functions: as_esri_geometry(), as_esri_features(), as_esri_featureset(), as_features() and as_featureset() have been rewritten from the ground up using Rust and extendr.
- arcgisutils now requires Rust to build from source
- jsonify is moved to Suggests
- as_geometry() is no longer exported
- ... argument is removed
auth_key() is added to support authorization with an API key for ArcGIS Developers accounts
catch_error() is a new function which parses a string and catches the error as an object. This is useful when processing multiple responses at once.
rbind_results() is a new helper function that combines a list of results as efficiently as possible.
arc_base_req() gains two new arguments path and query which allows you to add query parameters and paths to the generated base request
arc_self_meta() is a new function to provide access to the /self endpoint. Closes #32
Null geometries are parsed into empty Geometry Collections using sf::st_geometrycollection() Fixed #168
When Esri JSON contains 0 features, parse_esri_json() will create an empty data.frame with the fields that are returned with the appropriate R type.

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