Fix normal10/normal25 raid detection in scripts.

Replace HEROIC(n,h) macro by DUNGEON_MODE(n,h), RAID_MODE(n10,n25) and RAID_MODE(n10,n25,h10,h25) functions
Cleanup all HeroicMode like flags in ScriptedAI sub-class
Fix some missing virtual destructors

--HG--
branch : trunk

src/game/CreatureAIImpl.h

@@ -23,8 +23,6 @@
 #include "TemporarySummon.h"
 #include "CreatureAI.h"
 
-#define HEROIC(n,h) (HeroicMode ? h : n)
-
 template<class T>
 inline
 const T& RAND(const T& v1, const T& v2)

src/game/UnitAI.h

@@ -45,6 +45,8 @@ class TRINITY_DLL_SPEC UnitAI
         Unit * const me;
     public:
         explicit UnitAI(Unit *u) : me(u) {}
+        virtual ~UnitAI() {}
+
         virtual bool CanAIAttack(const Unit *who) const { return true; }
         virtual void AttackStart(Unit *);
         virtual void UpdateAI(const uint32 diff) = 0;