- Allow setting backdrill (from B.Cu up) and tertiary drill (from F.Cu
down) width and target layer (backdrill is inclusive)
- Allow setting post machining options (counterbore, countersink)
- Update properties for vias and THT pads
- Add output for Excellon and Gerber drill files as separated files for
different drill depths
- Add drill map output calling out post-machined holes
- Add STEP export support
- Add 3d-viewer support
- Add 2581 support using backdrill property. Post machining called out
in comments
- Add ODB++ support using separate drill file for each depth
- Add DRC check for tracks connected to pad layers that are backdrilled
or post-machined
Fixes https://gitlab.com/kicad/code/kicad/-/issues/18836
Seth Hillbrand
899d4888aa