Revert #1682 (three-axis milling) (#1715)

Thanks @bherbruck.

crates/ui-egui/src/theme.rs

@@ -207,12 +207,6 @@ pub struct Tokens {
     pub preview_sketch: Color32,
     /// Removed material in a feature preview (translucent).
     pub preview_cut: Color32,
-    // Manufacturing display.
-    pub cam_stock: Color32,
-    pub cam_fixture: Color32,
-    pub cam_cut: Color32,
-    pub cam_rapid: Color32,
-    pub cam_tool: Color32,
     /// Navigation cube faces, outline and labels.
     pub cube_face: Color32,
     pub cube_border: Color32,