Async loading item images => huge performance improvements for old machines.

Wox.Plugin/Result.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.IO;
 
 namespace Wox.Plugin {
 
@@ -9,6 +10,19 @@ namespace Wox.Plugin {
 		public string SubTitle { get; set; }
 		public string IcoPath { get; set; }
 
+	    public string FullIcoPath
+	    {
+	        get
+	        {
+	            if (IcoPath.StartsWith("data:"))
+	            {
+	                return IcoPath;
+	            }
+
+                return Path.Combine(PluginDirectory, IcoPath);
+	        }
+	    }
+
 		/// <summary>
 		/// return true to hide wox after select result
 		/// </summary>
@@ -38,6 +52,8 @@ namespace Wox.Plugin {
 			return r.Title == Title && r.SubTitle == SubTitle;
 		}
 
+
+
 		public override string ToString() {
 			return Title + SubTitle;
 		}