Refactoring. Move system plugins to seperate DLLs.

Plugins/Wox.Plugin.CMD/CMDStorage.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using Wox.Infrastructure.Storage;
+
+namespace Wox.Plugin.CMD
+{
+    public class CMDStorage : JsonStrorage<CMDStorage>
+    {
+        [JsonProperty]
+        public Dictionary<string, int> CMDHistory = new Dictionary<string, int>();
+
+        protected override string ConfigName
+        {
+            get { return "CMDHistory"; }
+        }
+
+        public void AddCmdHistory(string cmdName)
+        {
+            if (CMDHistory.ContainsKey(cmdName))
+            {
+                CMDHistory[cmdName] += 1;
+            }
+            else
+            {
+                CMDHistory.Add(cmdName, 1);
+            }
+            Save();
+        }
+
+    }
+}