Arch: added structural roles to Ifc import
Arch: added alternative load mode for IFC files for benchmarking
Arch: Structural nodes - closes #1313
Add unti support to Sketcher
Mouse wheel handling in InputField
fix negative value cascading in unti schemas
fix QString header in Unit
Try to fix std::abs() error...
Fix another one....
next gcc fix
Imperial Sketcher grid in Dialog
+ Fix build failure with gcc
Arch: added ifc writer
Arch: More work on the IFC exporter