Core/Spells Handle auras 328 & 396 (SPELL_AURA_TRIGGER_SPELL_ON_POWER_*)

Port From (https://github.com/TrinityCore/TrinityCore/commit/56e9560661adca81fc1e9a297cb6823cf7a6cb22)

Source/Framework/Constants/Spells/SpellAuraConst.cs

@@ -13,7 +13,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+ */
 
 namespace Framework.Constants
 {
@@ -576,4 +576,10 @@ namespace Framework.Constants
         Level4 = 3,
         TauntImmune = 4
     }
+
+    public enum AuraTriggerOnPowerChangeDirection
+    {
+        Gain = 0,
+        Loss = 1
+    }
 }

Source/Framework/Util/MathFunctions.cs

@@ -171,6 +171,11 @@ public static class MathFunctions
         return (ulong)(value * pct / 100.0f);
     }
 
+    public static float GetPctOf(float value, float max)
+    {
+        return value / max * 100.0f;
+    }
+
     public static int RoundToInterval(ref int num, dynamic floor, dynamic ceil)
     {
         return num = (int)Math.Min(Math.Max(num, floor), ceil);