Add support for loading and interacting with GeoJSON data in Blueprint #1651
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The companion to CesiumGS/cesium-native#1154. This PR adds blueprint functions for loading and interacting with GeoJSON data. In particular, it provides the ability to load GeoJSON from a string or from Cesium ion, the ability to query nodes, and the ability to obtain primitives as values usable in Unreal.
One note is that access to the properties of a vector node requires blueprint functionality for interacting with JSON objects. I elected to push this responsibility onto the JSON Blueprint Utilities plugin, which is an official Unreal plugin but not enabled by default. Returning the
FJsonObjectWrapperstruct from a method is supported without this plugin enabled, but users will have to enable that plugin if they want to be able to do anything with it.