*Add creature extra flag "immune to taunt" and "charmed ai".

*Fix the bug that creature still use its ai when charmed. Only creature with charmed ai flag can use its ai when charmed.

--HG--
branch : trunk

src/game/Creature.h

@@ -132,6 +132,8 @@ enum CreatureFlagsExtra
     CREATURE_FLAG_EXTRA_NO_XP_AT_KILL   = 0x00000040,       // creature kill not provide XP
     CREATURE_FLAG_EXTRA_TRIGGER         = 0x00000080,       // trigger creature
     CREATURE_FLAG_EXTRA_WORLDEVENT      = 0x00004000,       // custom flag for world event creatures (left room for merging)
+    CREATURE_FLAG_EXTRA_CHARM_AI        = 0x00008000,       // use ai when charmed
+    CREATURE_FLAG_EXTRA_NO_TAUNT        = 0x00010000,       // cannot be taunted
 };
 
 // GCC have alternative #pragma pack(N) syntax and old gcc version not support pack(push,N), also any gcc version not support it at some platform
@@ -671,6 +673,7 @@ class TRINITY_DLL_SPEC Creature : public Unit
         bool m_AlreadyCallAssistance;
         bool m_regenHealth;
         bool m_AI_locked;
+        bool m_AI_enabled;
         bool m_isDeadByDefault;
 
         SpellSchoolMask m_meleeDamageSchoolMask;