Issue #1234, #2058 - Rewrite log facility, improving thread implementation

src/plugin/PluginDebug.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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/>.
  */
 
 #ifndef _PLUGIN_DEBUG_H_
 #define _PLUGIN_DEBUG_H_
 
 #include <memory>
 #include <mutex>
+#include <string>
 
 namespace Trace
 {
   /**
    */
   struct Location
   {
     std::string prefixText;
     std::string postfixText;
 
@@ skipping 115 matching lines @@
    * Mutex to allow joint serialization of constructor/destructor calls.
    */
   static std::mutex mutex;
 
 public:
   LogQueueReference();
   ~LogQueueReference();
 };
 
 #endif // _PLUGIN_DEBUG_H_