Physics Support

- NEW CRATE: raidillon_physics.
- Added new models to be able to test the physics support.
- Added a new system "PhysicsSystem" to apply physics calculations to the ECS world.
- NEW COMPONENT: RigidBodyComponent

ecs/src/components.rs

@@ -15,3 +15,6 @@ impl Transform {
 }
 
 pub struct ModelHandle(pub ModelID);
+
+#[derive(Copy, Clone)]
+pub struct RigidBodyComponent(pub rapier3d::dynamics::RigidBodyHandle);