Add SOP-16_3.9x9.9mm_P1.27mm model

• A screenshot of the model(s) aligned with KiCad footprint(s)
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• Source files are contributed on the apropriate location
  • kicad-packages3D-generator!215 (merged)
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed on the model