Mounting Wuerth: Add all WA-SMSI M2.5 parts

[myfreescalewebpage]

Add all WA-SMSI M2.5 parts from https://www.we-online.com/catalog/en/SMSI_SMT_STEEL_SPACER_M2_5_THREAD_INTERNAL/ (the other sizes already exist)

Footprint PR: #2452
Footprint generator PR: pointhi/kicad-footprint-generator#608
Packages 3D PR: KiCad/kicad-packages3D#726
Packages 3D generator PR: easyw/kicad-3d-models-in-freecad#392

Image of the part from WE:

Screenshot of footprint:

Screenshot of 3D package (pointhi/kicad-footprint-generator#608):

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All contributions to the kicad library must follow the KiCad library convention

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

• Provide a URL to a datasheet for the footprint(s) you are contributing
• An example screenshot image is very helpful
• If there are matching symbol or 3D model pull requests, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.

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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). And you can speed up the process even more by providing a dimensioned drawing of your contribution. A tutorial on how to do that is found here: https://forum.kicad.info/t/how-to-check-footprint-correctness/9279 (This is optional!)

[myfreescalewebpage]

PS 1 : I have notice all the other Mounting Wuerth in the kicad-footprints repo are not exactly the ones generated by the generator. I don't know if this is normal but I can push a new PR if required.

PS 2 : I see other WA-SMSI have a 3D package. Is it generated with a script and if yes where is it ? I can do it for the M2.5 parts too.

[chschlue]

#1612
KiCad/kicad-packages3D#557
pointhi/kicad-footprint-generator#351
easyw/kicad-3d-models-in-freecad#284

I can only assume the current footprints were created using a previous script version (haven't checked in depth.)
@poeschlr

[myfreescalewebpage]

@chschlue thanks for the links! I will look to create the 3D corresponding to this PR now.
Strange that the footprint have not been updated if the script has been modified, isn't it ?
Here are the screenshots of the diff on 1 footprint. Not a lot of modifications, but some dimensions not match. Can be relevant for the review of this PR maybe: