Issue 5013 - Use const JsValue and pass reference where applicable

include/AdblockPlus/FilterEngine.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 516 matching lines @@
     JsEnginePtr jsEngine;
     bool firstRun;
     int updateCheckId;
     static const std::map<ContentType, std::string> contentTypes;
 
     explicit FilterEngine(const JsEnginePtr& jsEngine);
 
     FilterPtr CheckFilterMatch(const std::string& url,
                                ContentTypeMask contentTypeMask,
                                const std::string& documentUrl) const;
-    void UpdateAvailable(const UpdateAvailableCallback& callback, const JsValueList& params) const;
+    void UpdateAvailable(const UpdateAvailableCallback& callback, const JsConstValueList& params) const;
     void UpdateCheckDone(const std::string& eventName,
-                         const UpdateCheckDoneCallback& callback, const JsValueList& params);
-    void FilterChanged(const FilterChangeCallback& callback, const JsValueList& params) const;
+                         const UpdateCheckDoneCallback& callback, const JsConstValueList& params);
+    void FilterChanged(const FilterChangeCallback& callback, const JsConstValueList& params) const;
     void ShowNotification(const ShowNotificationCallback& callback,
-      const JsValueList& params) const;
+      const JsConstValueList& param) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask, const std::string& documentUrl) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask,
       const std::vector<std::string>& documentUrls) const;
   };
 }
 
 #endif