more shuffling; fix initial state

src/gear/device.rs

@@ -41,6 +41,16 @@ impl App {
     }
 }
 
+/// Has a chain of devices.
+pub trait HasDevices: AsRef<Vec<Device>> + AsMut<Vec<Device>> {
+    fn devices (&self) -> &Vec<Device> {
+        self.as_ref()
+    }
+    fn devices_mut (&mut self) -> &mut Vec<Device> {
+        self.as_mut()
+    }
+}
+
 #[tek_proc::command(Device)]
 #[tek_proc::keyword(Device)]
 #[derive(Debug)]