refactor(engine): flatten

- add `just stats`
- add basic doctests

device/scene.rs

@@ -1,5 +1,21 @@
 use crate::*;
 
+/// A scene consists of a set of clips to play together.
+///
+/// ```
+/// let scene: tek_device::Scene = Default::default();
+/// let _ = scene.pulses();
+/// let _ = scene.is_playing(&[]);
+/// ```
+#[derive(Debug, Default)] pub struct Scene {
+    /// Name of scene
+    pub name:  Arc<str>,
+    /// Identifying color of scene
+    pub color: ItemTheme,
+    /// Clips in scene, one per track
+    pub clips: Vec<Option<Arc<RwLock<MidiClip>>>>,
+}
+
 def_sizes_iter!(ScenesSizes => Scene);
 
 impl<T: Has<Vec<Scene>> + Send + Sync> HasScenes for T {}
@@ -143,16 +159,6 @@ pub trait ScenesView:
     }
 }
 
-#[derive(Debug, Default)]
-pub struct Scene {
-    /// Name of scene
-    pub name:  Arc<str>,
-    /// Identifying color of scene
-    pub color: ItemTheme,
-    /// Clips in scene, one per track
-    pub clips: Vec<Option<Arc<RwLock<MidiClip>>>>,
-}
-
 impl Scene {
     /// Returns the pulse length of the longest clip in the scene
     pub fn pulses (&self) -> usize {