World: Rename Update() to Refresh()

Also updated comment block

SDK/include/NDK/World.inl

@@ -278,21 +278,6 @@ namespace Ndk
 		RemoveSystem(index);
 	}
 
-	/*!
-	* \brief Updates the world
-	*
-	* \param elapsedTime Delta time used for the update
-	*/
-
-	inline void World::Update(float elapsedTime)
-	{
-		Update(); //< Update entities
-
-		// And then update systems
-		for (auto& systemPtr : m_orderedSystems)
-			systemPtr->Update(elapsedTime);
-	}
-
 	/*!
 	* \brief Moves a world into another world object
 	* \return A reference to the object