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

Thanks @bherbruck.

crates/ui-egui/src/colour_vision_tests.rs

@@ -253,17 +253,6 @@ fn groups(t: &Tokens) -> Vec<Group> {
     let ic = &t.icons;
     let a = &t.analysis;
     let mut out = vec![
-        group(
-            "manufacturing",
-            &[
-                ("cam_stock", t.cam_stock),
-                ("cam_fixture", t.cam_fixture),
-                ("cam_cut", t.cam_cut),
-                ("cam_rapid", t.cam_rapid),
-                ("cam_tool", t.cam_tool),
-            ],
-            &[("viewport_top", t.viewport_top), ("viewport_bottom", t.viewport_bottom)],
-        ),
         group(
             "sketch lines",
             &[
@@ -622,9 +611,7 @@ fn changed_fields(a: &Tokens, b: &Tokens) -> BTreeSet<String> {
 
 #[test]
 fn each_mode_changes_only_its_table() {
-    let set = |s: &[&str]| {
-        s.iter().copied().chain(["cam_stock", "cam_fixture", "cam_cut", "cam_rapid", "cam_tool"]).map(str::to_string).collect::<BTreeSet<_>>()
-    };
+    let set = |s: &[&str]| s.iter().map(|x| x.to_string()).collect::<BTreeSet<_>>();
     let red_green_both = [
         "triad",
         "gizmo",