Enlarge Adafruit Feather holes to 1mm
Fixes: #2515 (closed)
This makes the following changes:
- Expand the THT hole size to 1mm, the same as the usual THT 2.54mm pin headers to avoid being too tight with either low-tolerance PCBs or chunkier pin headers.
- Keep the 1.6mm pad size - they're under less stress than single headers (which are 1.7) due to being braced by the module and it makes routing that bit easier
- 0.25mm corner rounds for pin 1
- Fab ref des aligned and centred
I have NOT changed the courtyard, though I think there's an argument to make that at least 0.5mm like the ST Morpho and TI EUK modules. I am willing to make that change in this MR or a separate one.
I will aim to standardise other modules in the same way, once this MR irons out any questions.
FWIW, the Adafruit design files ALSO use 1mm holes for headers (this is the RP2040 one)
