Adding tweens to the pause menu

Now that we have the main menu finished, let's continue doing this with the pause menu:

1. Go ahead and open up our Gameplay scene. Update the PauseScreenBehaviour script to have the following implementation of SetPauseMenu:

/// <summary> 
/// Will turn our pause menu on or off 
/// </summary> 
/// <param name="isPaused"></param> 
public void SetPauseMenu(bool isPaused)
{
    paused = isPaused;

    // If the game is paused, timeScale is 0, otherwise 1 
    Time.timeScale = (paused) ? 0 : 1;

    // No longer needed
    //pauseMenu.SetActive(paused);

    if (paused)
    {
        SlideMenuIn(pauseMenu);
    }
    else
    {
        SlideMenuOut(pauseMenu);
    }

    if (paused)
    {
        var result = Analytics.CustomEvent("Paused");

        if (result == AnalyticsResult.Ok)
        {
            Debug.Log("Event Sent: Paused");
        }
    }
}

Note that because PauseMenuBehaviour inherits from MainMenuBehaviour, it also...