Hunt upgrade; no longer prism-cast

Hunt no longer requires a prism, no longer times out, and no longer has
any interaction with Cloak.

A player may now cast Hunt in any non-safe location, say a name, and
then be updated on the target's location when they move if the target is
a Murderer. Hunt cannot be used on innocents.

This is part of the ongoing effort to ensure that red players must
actually fight builts, and cannot just run around from safe zone to safe
zone after using scout mules to avoid all risk. This neatly counteracts
the tactic currently employed by PKs, whereby they bot online all day
every day so that hunters never know when they will pop out of the inn
and run for victims.

This will result in a situation where most built players will be informed
the moment major PKs leave the inn. From then on, it is a true chase,
rather than the murderer having complete safety from the inn to his victim.