Coding the GameObjectSharer class
This class will have two pure virtual functions that share GameObject instances with other classes.
Create a new header file in the Header Files/FileIO filter called GameObjectSharer.h and add the following code:
#pragma once
#include<vector>
#include<string>
class GameObject;
class GameObjectSharer {
public:
    virtual std::vector<GameObject>& getGameObjectsWithGOS() = 0;
    virtual GameObject& findFirstObjectWithTag(
             std::string tag) = 0;
};
The getGameObjectsWithGOS function returns a reference to the entire vector of GameObject instances. The findFirstObjectWithTag function returns just a single GameObject reference. We will see how we implement these functions when we inherit from GameObjectSharer when we code the LevelManager class next.
Briefly, before the LevelManager class, create a new...
