Add a deltatime variable to the update cycle

[Stuhl]

Pretty basic thing, yet not implemented. A deltatime variable in the ECS.update() method should be added to get rid of inconsistent frames.

I would suggest just passing the down to the processor which the update function (the one the user writes) can safely use.

update(entity: Entity, components: Component[], processor: Processor, deltaTime: number) {
  const [position, mass] = components

  const gravity = 2
  const result = mass.state.mass * gravity * deltaTime

  mass.state.velocityY += result
  position.state.y += mass.state.velocityY
}

A thing that annoys me a bit here, is the amount of arguments that the update function gets, when being called. I didn't like it before and now it looks even worse. I've added the entity and processor variables as a way to query/change things on edge cases but I don't know if they are actually really needed. People could just query the ECS class if they need it tbh.