Issue #1486 - Move PassthroughAPP code to its own directory

src/plugin/PluginWbPassThrough.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #pragma once
 #include <cstdint>
 #include <AdblockPlus/FilterEngine.h>
-#include "ProtocolCF.h"
-#include "ProtocolImpl.h"
+#include "passthroughapp/ProtocolCF.h"
+#include "passthroughapp/ProtocolImpl.h"
 #define IE_MAX_URL_LENGTH 2048
 
 class WBPassthruSink :
         public PassthroughAPP::CInternetProtocolSinkWithSP<WBPassthruSink, CComMultiThreadModel>,
         public IHttpNegotiate
 {
         typedef PassthroughAPP::CInternetProtocolSinkWithSP<WBPassthruSink, CComMultiThreadModel> BaseClass;
 
 public:
         WBPassthruSink();
@@ skipping 58 matching lines @@
   WBPassthru();
   // IInternetProtocolRoot
   STDMETHODIMP Start(LPCWSTR szUrl, IInternetProtocolSink *pOIProtSink,
     IInternetBindInfo *pOIBindInfo, DWORD grfPI, HANDLE_PTR dwReserved) override;
 
   //IInternetProtocol
   STDMETHODIMP Read(/* [in, out] */ void *pv,/* [in] */ ULONG cb,/* [out] */ ULONG *pcbRead) override;
 
   bool m_shouldSupplyCustomContent;
 };