Core/AI: Implemented OnSpellCastInterrupt and OnSuccessfulSpellCast hooks

Ported from: 020825902c and 1aa42e97a8

(cherry picked from commit f1e4ee21f8da41c71f4cbafaa85e89c6275c1db2)

src/server/game/AI/CreatureAI.h

@@ -141,6 +141,12 @@ class TC_GAME_API CreatureAI : public UnitAI
         virtual void SpellHitTarget(Unit* /*target*/, SpellInfo const* /*spellInfo*/) { }
         virtual void SpellHitTargetGameObject(GameObject* /*target*/, SpellInfo const* /*spellInfo*/) { }
 
+        // Called when a spell cast gets interrupted
+        virtual void OnSpellCastInterrupt(SpellInfo const* /*spell*/) { }
+
+        // Called when a spell cast has been successfully finished
+        virtual void OnSuccessfulSpellCast(SpellInfo const* /*spell*/) { }
+
         // Should return true if the NPC is currently being escorted
         virtual bool IsEscorted() const { return false; }
 
@@ -152,12 +158,6 @@ class TC_GAME_API CreatureAI : public UnitAI
 
         void OnCharmed(bool isNew) override;
 
-        // Called when a spell cast gets interrupted
-        virtual void OnSpellCastInterrupt(SpellInfo const* /*spell*/) { }
-
-        // Called when a spell cast has been successfully finished
-        virtual void OnSuccessfulSpellCast(SpellInfo const* /*spell*/) { }
-
         // Called at reaching home after evade
         virtual void JustReachedHome() { }