usecrate::Scene;pubmodphysics_system;pubuse rapier2d;useABC_ECS::World;pubfnadd_default_physics_systems(world:&mut World){// remove all physics systems to prevent duplicates
world.remove_all_systems_of_type::<physics_system::RapierPhysicsSystem>();let physics_system =physics_system::RapierPhysicsSystem::new(&mut world.entities_and_components);
world.add_system(physics_system);}