T09a overlays: popover, hover card, dialog with fullscreen, alert, confirm and prompt dialogs; shared severity; tooltip, sheet and drawer point to their homes

src/overlays/mod.rs

@@ -0,0 +1,11 @@
+mod dialog;
+mod dialogs;
+mod hover;
+mod popover;
+#[cfg(all(test, feature = "test-support"))]
+mod tests;
+
+pub use dialog::{Close, Dialog};
+pub use dialogs::{AlertDialog, ConfirmDialog, PromptDialog};
+pub use hover::HoverCard;
+pub use popover::Popover;