Added QFN-64-1EP_9x9mm_P0.5mm_EP4.1x4.1mm~

Datasheet: https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf

Source: kicad-packages3D-generator!101 (merged)

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• A screenshot of the model(s) aligned with KiCad footprint(s)
• Source files are contributed on the apropriate location
  • Link to the package3d-source pull request or to the script pull request
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
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• WRL model uses correct material properties
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