Added 3D for ProAnt PRO-OB-471

[cnieves1]

Datasheet: http://www.proant.se/files/user/Documents/Datasheets%20and%20appnotes/OnBoard%20SMD/Application%20Notes/2019-09-25/OnBoard%20SMD%20868%20rev3.4.pdf
Source: KiCad/kicad-packages3D-source#275
Footprint: KiCad/kicad-footprints#2193

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Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items as you complete them:

• A screenshot of the model(s) aligned with KiCad footprints is very useful
• Was the 3D model(s) created in a mechanical modelling program?
• Source files (or scripts) have been contributed
• 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 against mechanical models