revC3: Marked non schematic/bom parts correctly.

revC3: Use the new KiCad DNP flag for the DNP parts.

revC3: Final cleanups before production. * Changed 3D models to step so the 3D model can be exported for enclosure CAD. * Changed silk and stop colors to match 1BitSquared production boards

revC3: Updated to the new stable KiCad V6. This includes updating the KiCad system 3D model library path variable.