inspect.compare: where two versions of a part differ, without a boolean of the two (#1423)

New command inspect.compare {a, b, tolerance?}: measures of both and their differences, two-way surface deviation from a bounding-volume tree, regions beyond the tolerance clustered by side (only_in_a / only_in_b) with integrated volumes and faces, a verdict, optional face colouring as one undo step, and warnings for open meshes. Geometry in solidcraft-geom (compare.rs), command in the engine. Closes #1363.

assets/locales/de.json

@@ -555,6 +555,7 @@
   "cmd.file_slicers": "Installierte Slicer",
   "cmd.inspect_accessibility": "Zugänglichkeitsanalyse",
   "cmd.inspect_center_of_mass": "Massenschwerpunkt",
+  "cmd.inspect_compare": "Körper vergleichen",
   "cmd.inspect_curvature_comb": "Krümmungskamm-Analyse",
   "cmd.inspect_curvature_map": "Krümmungskartenanalyse",
   "cmd.inspect_draft": "Auswinkelanalyse",