Add Wuerth Redcube terminal blocks

[chschlue]

FP: KiCad/kicad-footprints#2287
Source: KiCad/kicad-packages3D-source#284

Part	Screenshot
WP-THRBU 74650073
WP-THRBU 74650074
WP-THRBU 74650094
WP-THRBU 74650173
WP-THRBU 74650174
WP-THRBU 74650194
WP-THRBU 74650195
WP-THRBU 74655095
WP-THRSH 74651173
WP-THRSH 74651174
WP-THRSH 74651175
WP-THRSH 74651194
WP-THRSH 74651195

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Thanks for creating a pull request to contribute to the KiCad libraries!
Remember you must be the legal owner of the 3D model! Models downloaded from a manufacturers website cannot be accepted.

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 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

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Be patient, we maintainers are volunteers with limited time and need to check your contribution against the datasheet. You can speed up the process by providing all the necessary information (see above).

[chschlue]

@rleh thoughts?

[rleh]

Nice! I'll take a closer look at it at the end of the week (and do a review).