[Feature Request] Support GBC-style link ports

[Q-Bert-Reynolds]

DMG link ports can only be harvested from other DMGs. GBC/GBP/GBA link ports, on the other hand, are readily available from all sorts of places, and I'm at least pretty sure there's enough room between the DMG link port pins and the edge of the board to support that footprint.

The only bit that feels a little iffy is how close the GBC link port housing through holes would be to the DMG link port ones, but I feel pretty confident they could be omitted and the GBC link port housing pins could just be bent out to fit. Here's a crude drawing:

This addition would bring this project one step closer to helping people build functioning DMGs without harvesting a single DMG part. Thank you for your consideration.