More export by occ possible with step, GLTF and obj #104

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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 7.9.3, here in use 7.4.0

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update to higher version than here used 7.4.0, actual is 7.9.3 and extend export to more formats.

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