Product attributes metadata for step files is now handled during import.
Attribute ReadProductMetadata is added to DESTEP_Parameters.
Method STEPCAFControl_Reader::ReadMetadata() is partially refactored.
Metadata tests for STEP are updated with new data.
Metadata tests for GLTF are updated with new data (since original
metadata in those tests is acquired from STEP files).
Limited support of metadata import is added to RWGltf_GltfJsonParser.
Following Json data types are currently supported: int32, double, string,
array of int32, array of double, array of strings, Json object.
Notable unsupported types are: binary data, array of Json objects.
Metadata is processed for nodes and meshes.
Tests "gltf_export" are updated with import testing and renamed to "gltf".
Method RWGltf_GltfJsonParser::gltfParseSceneNode() is slightly
refactored: parsing of transformations and transformation matrices is
moved into separate functions.
