feature: npc/player hit reactions

This works as in vanilla: 
   if actor had started attack before got hit - then he can continue it while 'hit' animation is playing,
   if haven't - then he don't have possibility to start attacking (and/or moving/jumping).
My initiative: If actor was hit while jumping - then 'knockdown' animation is played.

Also I've removed some mess with choosing death animations in CharacterController class.