Remove instance logic for BinaryStorage and JsonStorage, part 1

1. part of #389
2. huge refactoring

Wox/Storage/UserSelectedRecordStorage.cs

@@ -5,13 +5,11 @@ using Wox.Plugin;
 
 namespace Wox.Storage
 {
-    public class UserSelectedRecordStorage : JsonStrorage<UserSelectedRecordStorage>
+    public class UserSelectedRecord
     {
         [JsonProperty]
         private Dictionary<string, int> records = new Dictionary<string, int>();
 
-        protected override string FileName { get; } = "UserSelectedRecords";
-
         public void Add(Result result)
         {
             if (records.ContainsKey(result.ToString()))
@@ -22,7 +20,6 @@ namespace Wox.Storage
             {
                 records.Add(result.ToString(), 1);
             }
-            Save();
         }
 
         public int GetSelectedCount(Result result)