Issue #1234 - Eliminate CString from PluginSettings.* and PluginUserSettings.*

src/plugin/PluginClass.cpp

 /*
  * 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
@@ skipping 1107 matching lines @@
           if (FAILED(hr))
           {
             DEBUG_ERROR_LOG(hr, PLUGIN_ERROR_NAVIGATION, PLUGIN_ERROR_NAVIGATION_SETTINGS, "Navigation::Failed")
           }
         }
       }
       break;
     }
   case ID_MENU_DISABLE_ON_SITE:
     {
-      CPluginSettings* settings = CPluginSettings::GetInstance();
       std::wstring urlString = GetTab()->GetDocumentUrl();
       std::string filterText = client->GetWhitelistingFilter(urlString);
       if (!filterText.empty())
       {
         client->RemoveFilter(filterText);
       }
       else
       {
-        settings->AddWhiteListedDomain(ToCString(client->GetHostFromUrl(urlString)));
+        CPluginSettings::GetInstance()->AddWhiteListedDomain(client->GetHostFromUrl(urlString));
       }
     }
   default:
     break;
   }
 
   // Invalidate and redraw the control
   UpdateStatusBar();
 }
 
@@ skipping 584 matching lines @@
           s_criticalSectionLocal.Unlock();
 
         }
       }
     }
 
     hTabWnd = ::GetWindow(hTabWnd, GW_HWNDNEXT);
   }
   return hTabWnd;
 }