custom camera rig

* should not go into level geometry anymore

src/physics_layers.rs

@@ -0,0 +1,8 @@
+use avian3d::prelude::PhysicsLayer;
+
+#[derive(PhysicsLayer, Clone, Copy, Debug, Default)]
+pub enum GameLayer {
+    #[default]
+    Level,
+    Player,
+}