Surface Sweep: sheets carried from open curves and profiles along a path (#843)

Surface Sweep carries open curves and closed profile boundaries along a sketch path into surface bodies, with smooth walls along curved point paths. Adds the SurfaceSweep feature (format 18 note), the surface.sweep command, a dialog with Edit Feature support, and kernel and engine tests.

Part of #757.

crates/kernel/src/lib.rs

@@ -117,7 +117,8 @@ pub use step_in::{ImportedBody, StepImport, StepNode, step_import, step_import_s
 pub use step_out::{ExportBody, ExportProduct, StepHeader, step_export_bodies, step_export_products};
 pub use surface_kind::{FaceSurface, face_surface};
 pub use surfaces::{
-    copy_faces, extend, extrude_sheet, patch_edges, patch_region, remove_faces, reverse_faces, revolve_sheet, stitch, thicken, trim, unstitch,
+    copy_faces, extend, extrude_sheet, patch_edges, patch_region, remove_faces, reverse_faces, revolve_sheet, stitch, sweep_sheet,
+    sweep_sheet_points, thicken, trim, unstitch,
 };
 pub use sweep_path::sweep_path;
 pub use topo::{CylinderFace, cylinder_face_at};