T09b overlays: lightbox, spotlight and tour, floating toolbar, peek; images fill their box; overlays take focus back when its element leaves the tree

src/overlays/mod.rs

@@ -1,11 +1,17 @@
 mod dialog;
 mod dialogs;
+mod floats;
 mod hover;
+mod lightbox;
 mod popover;
+mod spotlight;
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
 pub use dialog::{Close, Dialog};
 pub use dialogs::{AlertDialog, ConfirmDialog, PromptDialog};
+pub use floats::{FloatingToolbar, Peek};
 pub use hover::HoverCard;
+pub use lightbox::{Lightbox, Slide};
 pub use popover::Popover;
+pub use spotlight::{Spotlight, Tour, TourStep};