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kicad: convert fab.mod + add usb micro footprint

See merge request !3

Newer versions of KiCAD treat `.mod` footprint libraries as "legacy" and will
refuse to edit them. This commit converts the library to the new `.pretty`
format.

Note that the new format is a folder with loose `.kicad_mod` files, so it
needs to be zipped for distribution.

Additionally, a footprint was added for the USB micro-B socket that claims to
be on inventory.

starting to breakout libraries, adding fun components - atsamd51, as5047, two h-bridges, some motor drivers, directfets, etc oh my