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.

docs/features.md

@@ -298,7 +298,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Add Recorded Feature | `timeline.add` | – |
 | Export Command Script | `timeline.export_script` | – |
 
-## Inspect (12, 1 planned)
+## Inspect (13, 1 planned)
 
 | Command | Id | Toolbar |
 |---|---|---|
@@ -314,6 +314,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Continuity Analysis *(planned: [#770](https://github.com/bherbruck/solidcraft/issues/770))* | `inspect.continuity` | SURFACE › INSPECT |
 | Interference | `inspect.interference` | SOLID › INSPECT |
 | Measure (I) | `inspect.measure` | SOLID › INSPECT |
+| Compare Bodies | `inspect.compare` | – |
 | Section Analysis | `inspect.section` | SOLID › INSPECT |
 
 ## Files (8)