🔥 Refactor TypeId/Any use, drop own Handle

src/core.rs

@@ -1,5 +1,32 @@
 //! Key types and functions for creating actions, components, packages, and themes.
 
+use crate::util;
+
+use std::any::Any;
+
+// Common definitions for core types.
+pub trait AnyBase: Any {
+    fn single_name(&self) -> &'static str;
+
+    fn as_any_ref(&self) -> &dyn Any;
+
+    fn as_any_mut(&mut self) -> &mut dyn Any;
+}
+
+impl<T: Any> AnyBase for T {
+    fn single_name(&self) -> &'static str {
+        util::single_type_name::<Self>()
+    }
+
+    fn as_any_ref(&self) -> &dyn Any {
+        self
+    }
+
+    fn as_any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+}
+
 // API to define functions that alter the behavior of PageTop core.
 pub mod action;