Added a class to manage shared assets.

- Stuff like player images, enemy images, menu images, etc
Added an asset for an empty menu
Added some shared assets in a very dubious manner
Updated to shared assets for Menus
Added a pointer asset for menus
Added pointer asset to shared assets
Added menu drawing to Menu superclass.
Changed initialization order to wait for graphics
Update to poiner graphics, now displays in action.
Merge branch 'master' of ssh://github.com/Senney/CPSC599-RPG