More export by occ possible with step, GLTF and obj

[stefano2734]

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actual python-occ-core can export more formats with step, obj and GLTF https://github.com/tpaviot/pythonocc-core Actual version is 7.8.1.1, here in use 7.4.0

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update to higher version than here used 7.4.0, actual is 7.8.1 and extend export to more formats.

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