Add support for MAXAR_mesh_variants #773
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Builds on: CesiumGS/cesium-native#465
Added support for MAXAR_mesh_variants. GlTF nodes using the extension can now switch between multiple meshes, each representing a unique named variant. This is useful for representing things such as damage states (e.g., a vehicle parts that are pristine, damaged, destroyed, etc.).
Added a blueprint API to query and change the current variant mesh of a glTF node.
In this example, the tire mesh variants are switched from "Pristine" to "Damaged" when "hit".