Code cleanup, clearer comments + removed some unnecessary dupe;

Removed `Frames` struct return for `window::frames()` since we are just redrawing every window anyways;
Interface dropping;

examples/multi_window/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-iced = { path = "../..", features = ["debug", "multi_window", "tokio"] }
+iced = { path = "../..", features = ["debug", "multi-window", "tokio"] }
 env_logger = "0.10.0"
 iced_native = { path = "../../native" }
 iced_lazy = { path = "../../lazy" }

examples/solar_system/src/main.rs

@@ -89,7 +89,7 @@ impl Application for SolarSystem {
     }
 
     fn subscription(&self) -> Subscription<Message> {
-        window::frames().map(|frame| Message::Tick(frame.at))
+        window::frames().map(Message::Tick)
     }
 }