Core/Auras: Defined and implemented new aura state

Port From (https://github.com/TrinityCore/TrinityCore/commit/d82a018b5b72adeea95483aedfa774381c5668e9)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -2700,6 +2700,7 @@ namespace Framework.Constants
         RaidEncounter = 22,           // Cctt|
         Healthy75Percent = 23,           // C   |
         WoundHealth35_80 = 24,            //   T |
+        Wounded50Percent = 25, // C T |
         Max,
 
         PerCasterAuraStateMask = (1 << (RaidEncounter2 - 1)) | (1 << (RoguePoisoned - 1))

Source/Game/Entities/Unit/Unit.cs

@@ -175,6 +175,7 @@ namespace Game.Entities
                 ModifyAuraState(AuraStateType.WoundHealth20_80, HealthBelowPct(20) || HealthAbovePct(80));
                 ModifyAuraState(AuraStateType.Healthy75Percent, HealthAbovePct(75));
                 ModifyAuraState(AuraStateType.WoundHealth35_80, HealthBelowPct(35) || HealthAbovePct(80));
+                ModifyAuraState(AuraStateType.Wounded50Percent, HealthBelowPct(50));
             }
 
             UpdateSplineMovement(diff);