Added IXYS_Flatpak-8_6.4x9.7mm_P2.54mm and IXYS_SMD-8_6.3x9.7mm_P2.54mm

This MR adds two 3D models for the IXYS_Flatpak-8_6.4x9.7mm_P2.54mm and IXYS_SMD-8_6.4x9.7mm_P2.54mm for the IXYS LOC112 symbols.

They are generator produced and are related to the following MRs:

Datasheet: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=996c6e8f-cc1b-44f6-811e-251c6e004c56&filename=littelfuse-integrated-circuits-loc112-datasheet

Symbol MR: kicad-symbols!4456 (merged)

Footprint MR: kicad-footprints!3599 (merged)

Footprint gen MR: kicad-footprint-generator!1098 (merged)

3D model gen MR: kicad-packages3D-generator!191 (merged)

IXYS_Flatpak-8_6.3x9.7mm_P2.54mm

IXYS_SMD-8_6.3x9.7mm_P2.54mm

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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
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed on the model