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Pixar recently released USD 20.02 [1]. I think it's important for people to be able to figure out which version of the USD library is used in Blender. [1] https://github.com/PixarAnimationStudios/USD/releases/tag/v20.02 This commit exposes the USD library information via `bpy.app.usd`, and includes that info in the `system-info.txt` saved via Help → Save System Info. Reviewed by: brecht Differential Revision: https://developer.blender.org/D6724