Assuming I'm going to keep ordering boards from MacroFab, it makes sense
to use their house parts as much as possible.  Therefore, the next
boards will use a C&K PTS810 as the Setup switch instead of an Alps
SKQG.  In addition to saving money, this change allows room for larger
"Setup" and "GND" labels.

MacroFab wants oval drills to be marked on the board edge layer, so
that's what I'm doing.  Hopefully they'll be able to handle oval drills
better soon, given a recent comment on their blog.

My USB Type-C connectors were merged into the KiCad
Connectors_USB.pretty footprint library, so I can use it from the normal
library now.

With the VBUS symbol merged into the KiCad library, I no longer need to
use my own.  This commit changes the schematic to use the standard VBUS
symbol rather than a custom one.

The SOT-89 footprint changed its name slightly in the KiCad library,
so the voltage regulator has been updated accordingly.  It has a nice
new 3D model too.  It's not weird and blue anymore.  I like it.

The SOD-123 was also updated to have a 3D model.  The board now only
lacks models for the footprints I made myself.  Heh.

That library is getting less important though, thankfully.  Still, while
it has symbols we need, it should be accessible.

In preparation for adding a second board (the programming jig) to this
repository, I've moved the PD Buddy Sink files to their own directory.