Update grid system. Try to fix some crashes and transport passengers (now they are despawned after a while).

src/server/game/Entities/Pet/Pet.cpp

@@ -33,7 +33,7 @@
 
 #define PET_XP_FACTOR 0.05f
 
-Pet::Pet(Player* owner, PetType type) : Guardian(NULL, owner),
+Pet::Pet(Player* owner, PetType type) : Guardian(NULL, owner, true),
 m_usedTalentCount(0), m_removed(false), m_owner(owner),
 m_happinessTimer(7500), m_petType(type), m_duration(0),
 m_auraRaidUpdateMask(0), m_loading(false), m_declinedname(NULL)
@@ -50,8 +50,6 @@ m_auraRaidUpdateMask(0), m_loading(false), m_declinedname(NULL)
 
     m_name = "Pet";
     m_regenTimer = PET_FOCUS_REGEN_INTERVAL;
-
-    m_isWorldObject = true;
 }
 
 Pet::~Pet()