Core/Auras: Implement SPELL_AURA_MOD_ENVIRONMENTAL_DAMAGE_TAKEN

Port From (https://github.com/TrinityCore/TrinityCore/commit/f12f3a972ff12168f07cee655077cc819b6dcaa2)

Source/Framework/Constants/Spells/SpellAuraConst.cs

@@ -457,7 +457,7 @@ namespace Framework.Constants
         Unk433 = 433,
         Unk434 = 434,
         Unk435 = 435,
-        ModEnvironmentalDamageTaken = 436, // NYI
+        ModEnvironmentalDamageTaken = 436,
         ModMinimumSpeedRate = 437,
         PreloadPhase = 438, // NYI
         Unk439 = 439,

Source/Game/Entities/Player/Player.cs

@@ -3995,6 +3995,8 @@ namespace Game.Entities
             if (IsImmuneToEnvironmentalDamage())
                 return 0;
 
+            damage = (uint)(damage * GetTotalAuraMultiplier(AuraType.ModEnvironmentalDamageTaken));
+
             // Absorb, resist some environmental damage type
             uint absorb = 0;
             uint resist = 0;