refactor: device abstraction, layout components

src/device/chain.rs

@@ -0,0 +1,21 @@
+use crate::prelude::*;
+
+pub struct Chain {
+    name:    String,
+    devices: Vec<Box<dyn Device>>
+}
+
+impl Chain {
+    pub fn new (name: &str, devices: Vec<Box<dyn Device>>) -> Result<DynamicDevice<Self>, Box<dyn Error>> {
+        Ok(DynamicDevice::new(render, handle, |_|{}, Self {
+            name: name.into(),
+            devices
+        }))
+    }
+}
+
+pub fn render (state: &Chain, buf: &mut Buffer, area: Rect) {}
+
+pub fn handle (state: &mut Chain, event: &EngineEvent) -> Result<(), Box<dyn Error>> {
+    Ok(())
+}