Shell world requires master builders ap rather than galactic wonders ap.
Shell world will reset its incorrect capital.
Fixed some localisation errors.

Trade zone support urban building_set.
Fallen empire's ship technologies now have prerequisites.

Fixed a bug where shell worlds would sometimes incorrectly transform into other planet classes.
Fixed a bug in extragalactic exploration events where providing food to the contact generation spaceship in the M106 galaxy consumed energy instead of food.

Added some small events.
Fallen empire's shell world would not be spawned on modded planet classes.

Updated some building_sets.

Pop growth provided by advanced clone vats will square down when there are no jobs available.
Fixed some localisation errors.

Added new models for shell world and its damaged version.

Fixed a bug where destroy a shell world will turn its lowest layer into megastructure.

Advanced clone vaut cannot clone pop without housing or job.
Advanced clone vaut support urban building set.

Added support for some interaction contents.
Fixed some incorrect icons.