Change plugin config file format (from ini to json)

Wox.Plugin/PluginInitContext.cs

@@ -8,7 +8,8 @@ namespace Wox.Plugin
     public class PluginInitContext
     {
         public List<PluginPair> Plugins { get; set; }
-        public PluginMetadata PluginMetadata { get; set; }
+        public PluginMetadata CurrentPluginMetadata { get; set; }
+
 
         public Action<string> ChangeQuery { get; set; }
         public Action CloseApp { get; set; }

Wox.Plugin/PluginMetadata.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 
@@ -7,12 +8,29 @@ namespace Wox.Plugin
 {
     public class PluginMetadata
     {
+        private int configVersion = 1;
+
+        /// <summary>
+        /// if we need to change the plugin config in the futher, use this to
+        /// indicate config version
+        /// </summary>
+        public int ConfigVersion
+        {
+            get { return configVersion; }
+            set { configVersion = value; }
+        }
+        public string ID { get; set; }
         public string Name { get; set; }
         public string Author { get; set; }
         public string Version { get; set; }
         public string Language { get; set; }
         public string Description { get; set; }
-        public string ExecuteFilePath { get; set; }
+
+        public string ExecuteFilePath
+        {
+            get { return Path.Combine(PluginDirecotry, ExecuteFileName); }
+        }
+
         public string ExecuteFileName { get; set; }
         public string PluginDirecotry { get; set; }
         public string ActionKeyword { get; set; }