Animation Update/Start Screen

-The elevator is now animated as it moves between floors (as are the
passengers within it).

-The amount that Passengers move each frame is now dependent on screen
width, rathern than being fixed.

-Framerate is set at 30 fps average using a variable sleep time at the
end of each frame.

-The start screen now has more options (as yet unimplemented) and has
actual graphics instead of bare buttons.  It is also now a fullscreen
activity.