It's a USB Type-C connector just like the one used in v0.1 and v0.2, but
with only SMT pins (except the fixing pins, of course).  They're
slightly cheaper and probably nicer for automated assembly, but
impossible to hand-solder.  That's okay though: where we're going, we
don't need hand-solderability.

That's the name they should have, since the board hasn't been called PD
Buddy since v0.1.

Google likes the name better this way.  Plus, it provides clear naming
for possible future PD Buddy products.

It was bidirectional on the Microcontroller sheet, which is wrong.  Now
it's input, like it should be.

I had the source and drain reversed—whoops.  After fixing it with an
X-Acto knife and some point-to-point wiring, I've updated the schematic
and PCB files accordingly.

THIS ALSO MARKS THE BEGINNING OF DEVELOPMENT OF THE NEXT BOARD REVISION.

Tested to probably not blow anything up if assembled properly!