When submitting the board to OSH Park (a popular hobbyist-friendly PCB
fabrication service), two issues are present with the OSSC PCB:
1. It contains plated slots (for the power and audio jacks, and the
component video connector). These *are* supported by OSH Park, but
lines must be added to the Edge.Cuts layer so that they are milled
out properly. Otherwise, a hole will just be drilled at the start of
the slot, and the rest of the slot will not be cut out.
OSH Park's upload system detects and warns users of this issue.
See: http://docs.oshpark.com/submitting-orders/cutouts-and-slots/https://hackaday.io/page/1224-plated-slots-for-oshpark-in-kicad
2. The holes for the audio ADC's oscillator are too small after being
plated, so the leads of the oscillator won't fit through.
This commit provides fixes for both these issues, and a small run has
been successfully produced by OSH Park and assembled by myself.
I have seen other patches for issue 1, but they replace the slots with
larger holes. This patch results in plated slots as originally intended.
