Add various Samtec mezzanine footprints from the Q Strip/Q Pairs, Basic Blade & Beam, Razor Beam, and mPOWER families

This pull request contains footprints for Altera HSMC cards. There are two variations, which use different connectors:

1. Samtec ASP-122952-01: a modified Samtec QTH-series connector with every third pin removed in Bank 1 to improve signal integrity for transceivers.
2. Samtec QTH-090-01-x-D-A: identical to the ASP-122952-01, except that all of the pins were left in Bank 1. It is not as good for transceivers, but is much more common.

The following footprints were added...

Samtec_HSMC_ASP-122952-01_P0.5mm_Vertical

Samtec_QTH-090-01-x-D-A_P0.5mm_Vertical

Samtec_HSMC_Card_QTH-090-01-x-D-A_3.076x0.932in_P0.5mm_Vertical

KLC Notes:

• The HSMC_Card footprint anchors are centered on the connector, not the courtyard. Changing this would cause issues with the 3D models.
• The HSMC_Card courtyards do not align to a 0.01mm grid, since the specifications were provided by the HSMC specification.
• Some 3D models are reused, so the footprint names do not always match.

See also:

• Pull request for HSMC_Card symbols
• Pull request for the 3D Models

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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:

• 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