Updates
-Updated DrawManager to use maps instead.  This will make it easier for us to get items later using a string as the item name.
-Added Item class and changed DrawManager to ItemManager.
-Set ItemManager draw method to take in canvas.  This is done because the canvas has to be locked for each draw since it is on a separate thread.
-Set update method for ItemManager to return various statuses.  This will be useful if an item should trigger a state change for example (like the finish line).