Fixed some issues wth horses. Tamed horses can only ever be ridden by their owners. Wild horses should now be protected like other creatures. Owned horses cannot be attacked/damaged, except when on a claim which the attacker has access trust on, and the horse has a rider who doesn't have that trust. Not sure the best way to set that up. Really it would fit to have new rules for mounting and attacking horses but.... yeah, people don't like the rules framework *sadface*, so instead, this is all gloriously hard-coded.