Connector_Wuerth: Add WR-WTB series

[antoniovazquezblanco]

Scripted

Datasheet: https://katalog.we-online.com/em/datasheet/6480xx11622.pdf
Script PR: pointhi/kicad-footprint-generator#393

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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.

[poeschlr]

Looks good, thanks

[antoniovazquezblanco]

Thanks!