Started work on a simple astronomy system, basically so that the moon can be represented properly for the werewolf system, but I figured I should probably do it right the first time, rather than have to come back and re-visit. Initially started working on it as an earth-centric system, but Sal pointed out that it would be better if it was sun-centric, which actually makes alot of it easier.

Still struggling with how to deal with loading Acorn map files into the server, and handle entity id parity with the client, which may have loaded a slightly different version of the same map. Do we need to extend the map format to include id?