Preview-generator

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Features
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- experimental GLTF format support (3d) in vtk builder: cc69ad08ef67517b04afe62d6ed58b2eb00ce9b8
- builders have now a weight permitting to know which builder will be used in case of conflict: 237

Fixed issues
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- many builders dependencies are now optional: 235

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Fixed issues
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- many builders dependencies are now optionals: 235

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Fixed issues
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- remove the wand builder from default builders: 235

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Fixed issues
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- properly kill LibreOffice if the timeout is reached: 231


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Fixed issues
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- add Python 3.9 support: 227


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Fixed issues
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- fix PDF support with the new pivot code: 224


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