Add .3mf file support - #92
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Hi @chamburr
This PR adds preview support for .3mf files, the format most 3D printing slicers export. The model is rendered with native SceneKit and can be rotated and zoomed.
It renders the same way as the native STL viewer.
3mf is a container opened as a ZIP, and the model parts are XML parsed with XMLParser.
As some models are quite big, I used the File.archiveExtensions to move the file size limit from 10Mb to 200Mb.
Tested with Bambu Studio and FreeCAD exports, and with deliberately broken files.