Stripped down version of #1818. No new features. Refactors
IsPossibleTarget in AttackersValue.cpp to a better style and makes sure
pets don't attack in prohibited zones.
Testing:
Confirmed that aggro pets no longer attack in PVP prohibited areas, but
still do outside them. Zim'Torga in Zul'Drak is a good example to test
this (ID 4323). Lookout for death knights with a Risen Ally
(uncontrolled and naturally aggro) now they respect PVP prohibition like
their master.
Note: If you manually teleport a bot that is in mid combat to a PVP
prohibited area, its aggro pet might still attack, because its master is
still in combat strategy. Otherwise the pet will not attack if its
master has switched to non-combat.
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