GLTFExpporter: Support morph targetNames #13366
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glTF 2.0 doesn't have morph target names in core spec.
But storing them into mesh.extra is suggested in glTF spec issue thread KhronosGroup/glTF#1036
Let's do that so far in
GLTFExportertil morph target names is supported in core (maybe glTF next?) not to lose useful information.Blender does it, too. KhronosGroup/glTF-Blender-Exporter#153