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.
Niet als je mijn onderstaande comment doorvoert. 

https://github.com/PimV/Bermuda-TheGame/pull/122#issuecomment-66884061