Add D52M

Created by: DanSGiesbrecht

Adding the "M8" form-factor D52M ANT module by Garmin Canada (Dynastream Innovations).

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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
  • Datasheet URL (warning - download)
• An example screenshot image is very helpful

Footprint:

Copper pads:

(datasheet, page 22)

Solder paste:

(datasheet, page 23)

• 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
  • Violating F6.2: Travis-CI thinks that the center of the pads represents the center of the part. This is incorrect. The anchor is correctly placed at the center of the module.
  • Violating F9.3: A 3D model has not been created. I plan on contributing this in the future.