remove modules and have single event manager (atomics feature parity + preparation for local state)

core/src/widget/handle.rs

@@ -94,6 +94,13 @@ pub trait IdLike {
     fn id(&self) -> WidgetId;
 }
 
+impl<W: Widget + ?Sized> IdLike for &WidgetHandle<W> {
+    type Widget = W;
+    fn id(&self) -> WidgetId {
+        self.id
+    }
+}
+
 impl<W: Widget + ?Sized> IdLike for WidgetHandle<W> {
     type Widget = W;
     fn id(&self) -> WidgetId {
@@ -108,6 +115,13 @@ impl<W: Widget + ?Sized> IdLike for WidgetRef<W> {
     }
 }
 
+impl IdLike for WidgetId {
+    type Widget = dyn Widget;
+    fn id(&self) -> WidgetId {
+        *self
+    }
+}
+
 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<WidgetHandle<U>> for WidgetHandle<T> {}
 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<WidgetRef<U>> for WidgetRef<T> {}