Physics2D: Fix the way newly physics entities are setup

include/Nazara/Physics2D/RigidBody2D.hpp

@@ -98,6 +98,8 @@ namespace Nz
 			void SetVelocity(const Vector2f& velocity);
 			void SetVelocityFunction(VelocityFunc velocityFunc);
 
+			void TeleportTo(const Vector2f& position, const RadianAnglef& rotation);
+
 			void UpdateVelocity(const Vector2f& gravity, float damping, float deltaTime);
 
 			void Wakeup();

include/Nazara/Physics2D/Systems/Physics2DSystem.hpp

@@ -38,9 +38,8 @@ namespace Nz
 			Physics2DSystem& operator=(Physics2DSystem&&) = delete;
 
 		private:
-			static void OnConstruct(entt::registry& registry, entt::entity entity);
-
 			entt::registry& m_registry;
+			entt::observer m_physicsConstructObserver;
 			entt::scoped_connection m_constructConnection;
 			PhysWorld2D m_physWorld;
 	};