Add task manager

src/ext/any.rs

@@ -0,0 +1,6 @@
+use std::any::Any;
+
+pub trait AsAny<T: Any + ?Sized> {
+    fn as_any(&self) -> &T;
+    fn as_any_mut(&mut self) -> &mut T;
+}

src/ext/mod.rs

@@ -1,3 +1,4 @@
+pub mod any;
 pub mod atomic;
 pub mod cstr;
 #[cfg(feature = "flagset")]