Minor fire tweak for readability and lethalness, remove exit condition that was hanging game (identified by jaylittle)

Revert prior attempted optimisation. Gridding the land pays in some situations, but not all. Restricting to an upper bound might help, but overall, seems too fuzzy to be worth it. On one side is increased cost of Add/Delete + extra test on collision check, on the other is skipping the list iteration. Perhaps for large lists.

Initialise to 0

Rename city to earthrise, replace old "earthrise" music w/ new City music on City/Planes