Design properties: project, author and licence in the design, its exports and inspect_design (#1015) (#1189)

A design carries metadata (format 21): project, part number, revision, author, organization, description and license, plus other tools' data under reverse-DNS keys, kept as written. Edited in the Design Properties window (Document Settings), set by document.metadata.set, reported by inspect_design, and written into STEP, IGES and 3MF where the format has a place for them. Translated, with tests.

crates/ui-egui/src/toolbar.rs

@@ -405,6 +405,11 @@ fn file_menu(app: &mut SolveApp, ctx: &egui::Context) {
                     close = true;
                 }
                 ui.separator();
+                if item_if(ui, &format!("{}…", app.tr_label("Design Properties")), "", shown) {
+                    app.start("document.metadata");
+                    close = true;
+                }
+                ui.separator();
                 if item(ui, &format!("{}…", app.tr("ui.preferences")), "") {
                     app.prefs_window.open = true;
                     close = true;