Add i18n support [WIP]

Wox.Infrastructure/ISingleton.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Wox.Infrastructure
+{
+    interface ISingleton<T>
+    {
+        T Instance { get; }
+    }
+}

Wox.Infrastructure/Wox.Infrastructure.csproj

@@ -57,6 +57,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Http\HttpProxy.cs" />
+    <Compile Include="ISingleton.cs" />
     <Compile Include="Logger\Log.cs" />
     <Compile Include="PeHeaderReader.cs" />
     <Compile Include="Storage\BinaryStorage.cs" />