Add API calls and stubs for filter matching and subscription management

shell/src/Main.cpp

 #include <AdblockPlus.h>
 #include <fstream>
 #include <iostream>
 #include <sstream>
 
 #include "GcCommand.h"
 #include "HelpCommand.h"
 #include "SubscriptionsCommand.h"
 #include "MatchesCommand.h"
 
@@ skipping 42 matching lines @@
   }
 }
 
 int main()
 {
   try
   {
     LibFileReader fileReader;
     CerrErrorCallback errorCallback;
     AdblockPlus::JsEngine jsEngine(&fileReader, 0);
-    jsEngine.Load("adblockplus_compat.js");
-    jsEngine.Load("adblockplus.js");
+    AdblockPlus::FilterEngine filterEngine(jsEngine);
 
     CommandMap commands;
     Add(commands, new GcCommand(jsEngine));
     Add(commands, new HelpCommand(commands));
-    Add(commands, new SubscriptionsCommand(jsEngine));
-    Add(commands, new MatchesCommand());
+    Add(commands, new SubscriptionsCommand(filterEngine));
+    Add(commands, new MatchesCommand(filterEngine));
 
     std::string commandLine;
     while (ReadCommandLine(commandLine))
     {
       std::string commandName;
       std::string arguments;
       ParseCommandLine(commandLine, commandName, arguments);
       const CommandMap::const_iterator it = commands.find(commandName);
       try
       {
         if (it != commands.end())
           (*it->second)(arguments);
         else
           throw NoSuchCommandError(commandName);
       }
       catch (NoSuchCommandError error)
       {
         std::cout << error.what() << std::endl;
       }
     }
   }
   catch (const std::exception& e)
   {
     std::cerr << "Exception: " << e.what() << std::endl;
   }
   return 0;
 }