Core/Items: Item bonus generation improvements

* Pass ItemContext to item creation wherever possible
* Support scaling item levels with m+ keystone levels (not used currently)
* Fixed item link validation when client sends it as default uninitialized bonus list with context only
* Support scaling items depending on current active season (seasons not implemented)
* Implemented content tuning redirection
Port From (https://github.com/TrinityCore/TrinityCore/commit/0fb8765a6638fd947b59fce44d5c31251d0cdadd)

Source/Game/Entities/Unit/Unit.cs

@@ -3886,7 +3886,7 @@ namespace Game.Entities
             }
 
             // Expansion and ContentTuningID necessary? Does Player get a ContentTuningID too ?
-            float armorConstant = Global.DB2Mgr.EvaluateExpectedStat(ExpectedStatType.ArmorConstant, attackerLevel, -2, 0, attackerClass);
+            float armorConstant = Global.DB2Mgr.EvaluateExpectedStat(ExpectedStatType.ArmorConstant, attackerLevel, -2, 0, attackerClass, 0);
             if ((armor + armorConstant) == 0)
                 return damage;