public ItemManagerComponent(Entity parent, EntityManager entityManager, PhysicsSimulator physics, Arena arena)
     : base(parent, "ItemManagerComponent")
 {
     this.entityManager = entityManager;
     this.physics = physics;
     this.arena = arena;
     this.Items = new List<Item>();
 }
 public RespawnableComponent(Entity parent, Arena arena)
     : base(parent, "RespawnableComponent")
 {
     this.arena = arena;
 }