Add all script generated molex slimstack footprints

This pull request adds the slimstack footprints (I did not change anything on purpose)

@evanshultz you added the 502429 and 502430 footprints. What is the difference between *10, *20 and *30? (Only difference i could see is a different datasheet link. But as far as i can tell it looks like they are completely equivalent otherwise.)

You also mirrored one of these two series. Should others also be mirrored?