Add scoped overlay hosts

src/lib.rs

@@ -16,6 +16,7 @@ pub mod attr;
 pub mod diagnostics;
 pub mod event;
 pub mod harness;
+pub mod overlay;
 pub mod platform;
 pub mod sense;
 pub mod state;
@@ -43,6 +44,7 @@ pub mod prelude {
     pub use event::*;
     pub use iris_core::*;
     pub use iris_macro::*;
+    pub use overlay::*;
     pub use platform::*;
     pub use sense::*;
     pub use state::*;