Move ABP JS code loading to FilterEngine and make it optional

src/FilterEngine.cpp

 #include <AdblockPlus.h>
 
 using namespace AdblockPlus;
 
+#if !FILTER_ENGINE_STUBS
+extern const char* jsSources[];
+#endif
+
 Subscription::Subscription(const std::string& url, const std::string& title)
   : url(url), title(title)
 {
 }
 
 FilterEngine::FilterEngine(JsEngine& jsEngine) : jsEngine(jsEngine)
 {
-  // TODO: Load ABP:
-  // jsEngine.Load("adblockplus_compat.js");
-  // jsEngine.Load("adblockplus.js");
+#if !FILTER_ENGINE_STUBS
+  for (int i = 0; jsSources[i] && jsSources[i + 1]; i += 2)
+    jsEngine.Evaluate(jsSources[i + 1], jsSources[i]);
+#endif
 }
 
 void FilterEngine::AddSubscription(Subscription subscription)
 {
   subscriptions.push_back(subscription);
 }
 
 void FilterEngine::RemoveSubscription(const Subscription& subscription)
 {
   for (std::vector<Subscription>::iterator it = subscriptions.begin();
@@ skipping 36 matching lines @@
   return subscriptions.size() && url.length() % 2;
 }
 
 std::vector<std::string> FilterEngine::GetElementHidingRules() const
 {
   std::vector<std::string> hidingRules;
   hidingRules.push_back("###ad");
   hidingRules.push_back("##.ad");
   return hidingRules;
 }