T07b navigation places: nav item and group, navigation menu, back and forward history, table of contents with anchors, go to line; measuring canvases pinned to their parent

src/navigation/mod.rs

@@ -1,15 +1,25 @@
 mod breadcrumb;
 mod editor_tabs;
+mod goto;
+mod history;
+mod menu;
+mod nav;
 mod overflow;
 mod pages;
 mod steps;
 mod tabs;
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
+mod toc;
 
 pub use breadcrumb::{Breadcrumb, Crumb};
 pub use editor_tabs::{EditorTab, EditorTabs};
+pub use goto::GoToLine;
+pub use history::BackForwardNavigation;
+pub use menu::NavigationMenu;
+pub use nav::{NavGroup, NavItem};
 pub use overflow::TabOverflowMenu;
 pub use pages::Pagination;
 pub use steps::{Steps, Wizard};
 pub use tabs::{TabPlacement, Tabs};
+pub use toc::{Anchor, Sections, TableOfContents};