Rewrite trainer handling to properly support multiple trainers on the same creature

Game/Entities/Player/Player.Fields.cs

@@ -140,6 +140,8 @@ namespace Game.Entities
 
         RestMgr _restMgr;
 
+        uint _currentTrainerId;
+
         //Combat 
         int[] baseRatingValue = new int[(int)CombatRating.Max];
         public float[][] m_auraBaseMod = new float[(int)BaseModGroup.End][];