refactor file hierarchy

BotSharp.Core/BotSharp.Core.csproj

@@ -23,11 +23,6 @@
     <PackageProjectUrl>https://github.com/Oceania2018/BotSharp</PackageProjectUrl>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Folder Include="Adapters\Lex\" />
-    <Folder Include="Adapters\Luis\" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="DotNetToolkit" Version="1.4.0" />
     <PackageReference Include="EntityFrameworkCore.BootKit" Version="1.6.0" />
@@ -35,4 +30,8 @@
     <PackageReference Include="RestSharp" Version="106.3.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Engines\BotSharp\" />
+  </ItemGroup>
+
 </Project>

BotSharp.Core/Engines/SpaCy/SpaCyProvider.cs

@@ -1,5 +1,4 @@
-using BotSharp.Core.Utilities;
-using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration;
 using RestSharp;
 using System;
 using System.Collections.Generic;

BotSharp.Core/Utilities/JsonContent.cs

@@ -1,16 +0,0 @@
-using Newtonsoft.Json;
-using System;
-using System.Collections.Generic;
-using System.Net.Http;
-using System.Text;
-
-namespace BotSharp.Core.Utilities
-{
-    public class JsonContent : StringContent
-    {
-        public JsonContent(object obj) :
-            base(JsonConvert.SerializeObject(obj), Encoding.UTF8, "application/json")
-        {
-        }
-    }
-}