Core/Spell Mechanics: introduce global cooldown manager for server-side checks for GCD (ported from mangos)

src/server/game/AI/CoreAI/PetAI.cpp

@@ -122,7 +122,7 @@ void PetAI::UpdateAI(const uint32 diff)
         return;
 
     // Autocast (casted only in combat or persistent spells in any state)
-    if (me->GetGlobalCooldown() == 0 && !me->HasUnitState(UNIT_STAT_CASTING))
+    if (!me->HasUnitState(UNIT_STAT_CASTING))
     {
         typedef std::vector<std::pair<Unit*, Spell*> > TargetSpellList;
         TargetSpellList targetSpellStore;
@@ -137,6 +137,9 @@ void PetAI::UpdateAI(const uint32 diff)
             if (!spellInfo)
                 continue;
 
+            if (me->GetCharmInfo() && me->GetCharmInfo()->GetGlobalCooldownMgr().HasGlobalCooldown(spellInfo))
+                continue;
+
             // ignore some combinations of combat state and combat/noncombat spells
             if (!me->getVictim())
             {