It should be possible to have `#[read_component(Component)]` and `&Component` on the same `for_each` system.

I have (a more complex version of) the following system:

```rust
struct Name;
struct InCryoTube(pub Entity);

#[system(for_each)]
#[read_component(Name)]
fn help_me(
name: &Name,
in_cryo_tube: &InCryoTube,
world: &mut legion::world::SubWorld,
) {
println!("{}", name);

let entity: Entity = in_cryo_tube.0;
let entry = world.entry_ref(entity).unwrap();
let name = entry.get_component::().unwrap(); // panic here
println!("{}", name);

}
```

Unfortunately it panics with this:
```
thread '' panicked at 'called `Result::unwrap()` on an `Err` value: Denied {
component_type: ComponentTypeId { type_id: TypeId { t: 12223289268359141760 },
name: "game::components::Name" }, component_name: "game::components::Name" }', src/main.rs:408:46
```

I know that this is to do with the limitations of `SubWorld`s, but it really should be possible to do this, as this is a fairly common pattern.