Space/Planet turf/areas

Z-Levels 1 & 2 default to planet tiles
Z-Levels 3+ default to space tiles

Deleted tiles make a planet tile.
Damaged tiles make the correct tile based on what Z-Level they are on.
To stop the merge complaining?

GIT
Let there be light on the planet

Make the planet light again.
Merge pull request #2 from SoundScopes/master

Space/Planet turf/areas