[svn] Remove isVisible function. Check stealth and invisible in canAttack();

Use new remove aura by interrupt flag function.

--HG--
branch : trunk

src/game/Creature.h

@@ -548,6 +548,7 @@ class TRINITY_DLL_SPEC Creature : public Unit
         uint32 m_GlobalCooldown;
 
         bool canSeeOrDetect(Unit const* u, bool detect, bool inVisibleList) const;
+        bool IsWithinSightDist(Unit const* u) const;
         float GetAttackDistance(Unit const* pl) const;
 
         void CallAssistence();