Added GUIMapEvents Container script and Blank Sprite Object for it

-Script has a small state machine to handle type of GUI to use according to MapEvent.cs, and also displays the main Container.
-Added a blank Sprite (GUIMapEventsSprite) object into arena01 scene to hold the script GUIMapEvents.cs .

TODO:
     +Create individual container for each event
     +still need to integrate with Actual MapEvent.cs script.
     +added some inputs using Alpha[1-6] for testing purpose, will remove after integration