Added an entity base class .
Added an actor class.
Added a camera class.
Created a selected ptr for selecting objects that recieve current movement events.  This is defaulted to the Camera at the moment.
Created a camera ptr for the current camera, there is only one at the moment.
GenerateEntities function to generate entities. har har
Added MOVE_UP and MOVE_DOWN events.  A designation of what these should be relative to is in order.
Updated TODO.org