Changed the default way to modify values in store. Added basic validation to stores. Using interfaces to DI store objects.

Store/UserStore.cs

@@ -39,7 +39,7 @@ namespace HermesSocketServer.Store
         {
         }
 
-        protected override void OnInitialModify(string key, User value)
+        protected override void OnInitialModify(string key, User oldValue, User newValue)
         {
         }