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.
When the compass has a fixed size, it is either too big for small sites,
or too small for big sites, when using fit view. So the compass adapts
to the ProjectedArea of the Site now.
When enabled, the whole coin scene graph is rotated by the declination
property of the site. So one can see the whole geometry oriented like in
real life.
The compass helps you to locate north in your drawings.
It has the following features:
- Can be hidden independently from the site. So you can still have the
site without the compass.
- Can be rotated relative to the site.
- Also rotates with the site
- Always sits 1 meter above the site geometry
https://forum.freecadweb.org/viewtopic.php?f=23&t=34669
* 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