Changed Renderer and MenuManager to use ConfigList

-Removed map for ConfigItems and replaced it with ConfigList in Renderer
and MenuManager
-Added setter/getter for ConfigList in MenuManager and Renderer
-Added call in GameManager to use the above methods to init ConfigList
in MenuManager
-Added MenuManager::InitConfigList() that
 sets all items in the ConfigList to the value set in ConfigLoader
-Adde MoveUp in ConfigItem so that the ScrollBar can be used
-Changed MenuManager to uee ConfigList instead of map.