Finally removed the stupid String form used for storing goodies in the
world, replaced with an actual java object WorldCoordinate. Provided
conversion methods to keep backwards compatibility with save file
format, but it was never a good idea to use a String like that; a full
object representing the data was a far better choice. Hence this update
is more of a minor refactoring of something that annoyed me for a long
time.

Also removed the starting extra lives in Spooked on the first screen.