Core/PlayerAI: Some adjustments:

- Add a 2 second delay before the AI begins using spells. This should provide opportunity for counterplay before that rogue activates cloak and goes on an unstoppable rampage among your healers. (Sorry, guys.)
- Stopped the AI from attacking invalid targets under some conditions. It should now properly leash back and follow the charmer if we try to select an invalid target.
- Stopped the AI from constantly re-creating the follow movement generator (and thus spamming movesplines).

src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_blackheart_the_inciter.cpp

@@ -57,26 +57,6 @@ enum Events
 class BlackheartCharmedPlayerAI : public SimpleCharmedPlayerAI
 {
     using SimpleCharmedPlayerAI::SimpleCharmedPlayerAI;
-    Unit* SelectAttackTarget() const override
-    {
-        if (Unit* charmer = me->GetCharmer())
-        {
-            std::list<Player*> targets;
-            for (ThreatReference const* ref : charmer->GetThreatManager().GetUnsortedThreatList())
-            {
-                if (Player* victim = ref->GetVictim()->ToPlayer())
-                    if (me->IsValidAttackTarget(victim))
-                        targets.push_back(victim);
-            }
-            if (targets.empty())
-                return nullptr;
-
-            auto it = targets.begin();
-            std::advance(it, urand(0, targets.size() - 1));
-            return *it;
-        }
-        return nullptr;
-    }
     void OnCharmed(bool apply) override
     {
         SimpleCharmedPlayerAI::OnCharmed(apply);