Core/AI: OnSpellCast, OnSpellFailed, OnSpellStart hooks

Port From (https://github.com/TrinityCore/TrinityCore/commit/050f55b62fded4cc73b76e42d56d98ea950cc26a)

Source/Framework/Constants/SmartAIConst.cs

@@ -237,8 +237,11 @@ namespace Framework.Constants
         SceneCancel = 80,      // none
         SceneComplete = 81,      // none
         SummonedUnitDies = 82, // CreatureId(0 all), CooldownMin, CooldownMax
+        OnSpellCast = 83,      // SpellID, CooldownMin, CooldownMax
+        OnSpellFailed = 84,      // SpellID, CooldownMin, CooldownMax
+        OnSpellStart = 85,      // SpellID, CooldownMin, CooldownMax
 
-        End = 83
+        End = 86
     }
 
     public enum SmartActions

Source/Framework/Constants/Spells/SpellConst.cs

@@ -98,13 +98,6 @@ namespace Framework.Constants
         Ranged = 2      //hunter range and ranged weapon
     }
 
-    public enum SpellFinishReason
-    {
-        SuccessfulCast = 0, // spell has sucessfully launched
-        Canceled = 1, // spell has been canceled (interrupts)
-        ChannelingComplete = 2  // spell channeling has been finished
-    }
-
     [Flags]
     public enum SpellInterruptFlags
     {