Allow attacks to transition into more states.#54

Right now, attacks only ever end in Idle, Fall, or Crouch as far as I understand. It would be awesome if you could set the attack to end in other states. For example, a tripping attack could put the character in Knockdown, or a dash attack that goes back to the Run state after it finishes.

If you could leave an attack in ANY state then it would open the door to some crazy stance characters and whatnot, but I imagine that would be a lot harder to implement.