Following the example of Arch_Wall:
- Fixed object name.
- Default label is translatable.
- Name argument should only be used for the label and not be translated.
Arch BuildingParts now gained a new set of View properties that allows
to define a "capture box". Subsequent Draft and Arch objects, or anything
else that uses Draft.autogroup(), will be automatically added to that
BuildingPart if they are inside the capture box.
Removes unused imports as reported by LGTM.
There are exceptions: `import Arch_rc` is shown as an alert, but has side effects. It's not clear what the best thing to do in those cases is, so I've left them for now.
* The import code will manually set 2x3 attributes
* The import code will rely on "smart" attributes for ifc 4
* ArchSite and ArchBuildingPart now support IFC
* IfcSite lat/lon is left alone until I better understand how coords work
