Project setup doesn't respect unit preferences for building size and axes distance

[pachi]

Building perimeter and axes distance are by default, and unless explicit units are provided, created using mm even if the preferred units are m. This feels a bit surprising.

To avoid confusion, maybe those parameters labels should show the required units (e.g. "Gross building width [mm]") or additional logic could be implemented to request the preferred units.

Maybe the simpler one is good enough in this case, although, as it's possible to use explicit units, it may be confusing in its own way.