Attack system on rabbits, no item drops yet

@PimV, @sagar193, @jhay 

needed to work around an crash, for some reason the killed rabbit isn't properly removed for the list.
That's why the respawn looks so odd.
De enum is om de attack animation te kunnen triggeren. Maar inderdaad, hij zou eigenlijk "Attack" moeten heten. Er staat ook geen "Choppable" enzo.