Major optimizations to turn simulation:
* autosave is done on a separate thread now and no longer stutters the game
* introduced some object pooling on world ships which decreases number of stutters
* dramatically improved pathfinding algorithm to almost completely remove end of turn stutters
Bugfixes:
* explicitly saved game screen mode setting (which is normally managed by the game engine) since it was not implicitly saved for some players
Goodies:
* new custom map, the Caribbean! This is the most dense map to date, featuring 60 cities! The map is directly inspired by the Port Royale 2 map.