Better expect error messages (#2629)

* Replace expect error messages

* Change message

* Create RuntimeError struct

* Pass error through core methods

* Fix use of Runtime::current in signals package

* Fix tests

* Add #[track_caller] for better error output and fix maybe_with_rt

* provide a help message along with RuntimeError

---------

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>

packages/core/src/properties.rs

@@ -130,9 +130,11 @@ pub fn verify_component_called_as_component<C: ComponentFunction<P, M>, P, M>(co
         }
         let component_name = Runtime::with(|rt| {
             current_scope_id()
+                .ok()
                 .and_then(|id| rt.get_state(id))
                 .map(|scope| scope.name)
         })
+        .ok()
         .flatten();
 
         // If we are in a component, and the type name is the same as the active component name, then we can just return