Start work on keyboard rework for mac

As of this checkpoint, we generate an keyboard-types KeyboardEvent,
but don't plumb it through as the actual druid-shell keyboard event.

Also, there is no dead-key handling at this point.

Work towards #1040

druid-shell/Cargo.toml

@@ -28,6 +28,7 @@ time = "0.2.16"
 cfg-if = "0.1.10"
 instant = { version = "0.1.4", features = ["wasm-bindgen"] }
 anyhow = "1.0.31"
+keyboard-types = { version = "0.5.0", default_features = false }
 
 # Optional dependencies
 cairo-rs = { version = "0.8.1", default_features = false, optional = true }

druid-shell/examples/shello.rs

@@ -63,13 +63,14 @@ impl WinHandler for HelloState {
     }
 
     fn key_down(&mut self, event: KeyEvent) -> bool {
-        let deadline = std::time::Duration::from_millis(500);
-        let id = self.handle.request_timer(deadline);
-        println!("keydown: {:?}, timer id = {:?}", event, id);
-
+        println!("keydown: {:?}", event);
         false
     }
 
+    fn key_up(&mut self, event: KeyEvent) {
+        println!("keyup: {:?}", event);
+    }
+
     fn wheel(&mut self, event: &MouseEvent) {
         println!("mouse_wheel {:?}", event);
     }