Don`t use references to JsEngine to avoid use-after-free errors,switch to shared_ptr instead

src/AppInfoJsObject.cpp

 #include <AdblockPlus/AppInfo.h>
 #include <AdblockPlus/JsValue.h>
 
 #include "AppInfoJsObject.h"
 #include "Utils.h"
 
 using namespace AdblockPlus;
 
-JsValuePtr AppInfoJsObject::Setup(JsEngine& jsEngine, const AppInfo& appInfo,
+JsValuePtr AppInfoJsObject::Setup(JsEnginePtr jsEngine, const AppInfo& appInfo,
     JsValuePtr obj)
 {
   obj->SetProperty("id", appInfo.id);
   obj->SetProperty("version", appInfo.version);
   obj->SetProperty("name", appInfo.name);
   obj->SetProperty("platform", appInfo.platform);
   return obj;
 }