Don't use std::string in the plugin, convert when communicating with the engine

src/plugin/PluginClass.cpp

 #include "PluginStdAfx.h"
 
 #include "PluginClass.h"
 #include "PluginSettings.h"
 #include "PluginSystem.h"
 #ifdef SUPPORT_FILTER
 #include "PluginFilter.h"
 #endif
 #include "PluginMimeFilterClient.h"
 #include "PluginClient.h"
@@ skipping 1754 matching lines @@
   CPluginTab* tab = GetTab(::GetCurrentThreadId());
   if (tab)
   {
     CPluginClient* client = CPluginClient::GetInstance();
 
 #ifdef PRODUCT_ADBLOCKPLUS
     if (!CPluginSettings::GetInstance()->IsPluginEnabled())
     {
     }
 #ifdef SUPPORT_WHITELIST
-    else if (client->IsWhitelistedUrl(ToUtf8String(std::wstring(url))))
+    else if (client->IsWhitelistedUrl(std::wstring(url)))
     {
       hIcon = GetIcon(ICON_PLUGIN_DISABLED);
     }
 #endif // SUPPORT_WHITELIST
     else
     {
       //Deativate adblock icon if adblock limit reached
       CPluginSettings* settings = CPluginSettings::GetInstance();
       if (!settings->GetPluginEnabled()) {
         hIcon = GetIcon(ICON_PLUGIN_DEACTIVATED);
@@ skipping 406 matching lines @@
         }
       }
     }
 
     hTabWnd = ::GetWindow(hTabWnd, GW_HWNDNEXT);
   }
 
   return hTabWnd;
 
 }