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. The lack of expiration
is necessary to counteract 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.

The lack of interaction with Cloak is to make this mechanic actually
function. Otherwise, PKs would just use Cloak and defeat the entire
purpose. Really, being red should require risk and PvP, not just
running around slaughtering newbies.

The removal of the prism requirement is to eliminate the mule basis
for this spell that was making it rarely used by anyone except
abusive vets.

This Hunt 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.
Allowing one murderer to be hunted per person is a soft system intended
to put more heat on PKs that cause more problems. If one PK plays
all day every day, they will have far more people watching them than
someone who is less damaging to the community.

This is going to make life far more difficult for murderers who are used
to avoiding all risk, but, at the same time, it doesn't actually affect
combat. It just gives hunters a much needed tool to actually chase PKs.

Seance and Cloak could probably use a redesign, although those
two spells still interact normally.