merge jack::client into jack

need to remove AudioEngine trait and register callbacks manually

src/jack/activate.rs

@@ -34,17 +34,3 @@ impl JackActivate for JackConnection {
         Ok(target)
     }
 }
-
-/// A UI component that may be associated with a JACK client by the `Jack` factory.
-pub trait AudioComponent<E: Engine>: Component<E> + Audio {
-    /// Perform type erasure for collecting heterogeneous devices.
-    fn boxed(self) -> Box<dyn AudioComponent<E>>
-    where
-        Self: Sized + 'static,
-    {
-        Box::new(self)
-    }
-}
-
-/// All things that implement the required traits can be treated as `AudioComponent`.
-impl<E: Engine, W: Component<E> + Audio> AudioComponent<E> for W {}